2008 Fleming considered himself to have turned properly professional in the summer of 2008, when he was 24. A week later, Fleming played the singles in the Nottingham Futures F15, this time losing in the quarter-finals.
Ken Skupski was looking for a fellow British doubles partner who was capable of going to the top of the game, and thought Fleming's game style suited his. Fleming/Skupski won three Futures in Glasgow, London, Sunderland and the
Caversham International Challenger in Jersey. The pair came to be known as 'Flemski'. Ken Skupski finished the year there because he'd had a long year, but Fleming continued by partnering
Jonny Marray in the Czech Republic and winning two Futures in Frydland Nad Ostravici, and Opava
2009 In February, the Davis Cup captain
John Lloyd decided to hold play-offs between six British tennis hopefuls to determine the players for the next tie. Fleming won one match, but
Josh Goodall and
Chris Eaton were chosen for the singles. Fleming had won six doubles tournaments matches in 2008 and was selected for the doubles. In March, Fleming, ranked 289, made his debut in Great Britain's Davis Cup team for their
Europe/Africa Zone Group I match against Ukraine in
Renfrewshire. Fleming and
Ross Hutchins, ranked 44, lost a tightly contested match to
Sergiy Stakhovsky and
Sergei Bubka, Ukraine winning 6–4, 3–6, 6–3, 5–7, 6–4 to give Ukraine an unassailable 3–0 lead. In June, Fleming/Skupski beat the world no. 1 ranked doubles pair,
Mike Bryan and
Bob Bryan, at the
Queen's Club grass court tournament. However they were put out in the first round at
Wimbledon in five sets having led by two sets to love. In September, Fleming/Skupski both won their first doubles tournament on the ATP Tour circuit at the
Open de Moselle in France 2–6, 6–4, [10–5]. A few months later they won their second title at the
St. Petersburg Open winning 2–6, 7–5, [10–4].
2010 mixed doubles final match. In January Fleming competed in his first grand slam outside of Wimbledon at the
Australian open again partnering Ken Skupski made it to the second round. In March, Fleming and Skupski were called to the Davis Cup team in the
Europe/Africa Zone Group II tie vs Lithuania, in Vilnius, with
James Ward, and
Dan Evans. The Lithuanian side entered the tie as underdogs; fielding a team of teenagers. Ward won his debut Davis Cup match but Evans lost the second singles match. Fleming and Skupski, in his debut match, won the doubles, but Ward and Evans were both beaten on the final day. This was described as a humiliating Davis Cup defeat for Great Britain, and led to the resignation of Davis Cup Captain John Lloyd. Britain was now threatened with relegation to the lowest tier of the competition. Fleming then competed at the
French open for the first time again partnering Ken Skupski but fell at the second round in three sets. Fleming/Skupski competed in the
Eastbourne Open in England and got to the final only to lose to
Mariusz Fyrstenberg and
Marcin Matkowski in three sets 3–6, 7–5, [8–10]. For the first time he made it into the second round of
Wimbledon but lost to the much more experienced
Bryan brother's in straight sets again partnering Ken Skupski. The new Davis Cup Captain
Leon Smith selected Fleming to take part in Great Britain's vital
Davis Cup tie vs Turkey, at Eastbourne, in July alongside Ken Skupski,
James Ward,
Jamie Baker, and
Alex Ward. Defeat would have meant Great Britain's relegation to
Europe Zone Group III, the lowest tier of the competition. Fleming/Skupski secured the 6–3, 6–4, 6–4 win that gave Britain an unassailable 3–0 lead, giving Great Britain a first Davis Cup win in three years. At the
2010 Commonwealth Games in
Delhi, Fleming and nineteen year old
Jocelyn Rae played Mixed Doubles for Scotland. They had barely met and did not even know they were playing together until they arrived. but won the
gold medal by defeating the No 1 seeds, Australians
Anastasia Rodionova and
Paul Hanley, in three sets. Rodionova had already won the Singles and Women's doubles. Fleming/Rae were unable to defend their title in 2014 because tennis was not included in the Glasgow Games. Fleming for the first time competed at the
US open and competed at all four grand slams for the first time. But fell in the first round in straight sets, once again partnering Ken Skupski. In October, Fleming split from Ken Skupski, after defeat in the first round of the
St. Petersburg Open, something which was particularly wounding given that the pair were defending the title. It meant Fleming's ranking dropped into the 90s when it was in the 60s at the start of the year.
2011 Fleming and Ross Hutchins struggled with injuries and interruptions for much of the first six months. In March, Fleming was called up to take part in Great Britain's
Davis Cup 1st round tie vs Tunisia, at Bolton alongside
Jamie Baker,
James Ward and
Jamie Murray. Fleming played alongside Jamie Murray versus
Slim Hamza and
Malek Jaziri, winning 6–1, 3–6, 6–3, 6–4. Great Britain went on to win the Europe/Africa Zone Group 1 tie 4–1. In April, while his regular partner, Ross Hutchins, recovered from injury, Fleming reached the final of the
ATP Casablanca Open in Morocco, this time partnering
Igor Zelenay only to be beaten by
Robert Lindstedt and
Horia Tecău in straight sets 2–6, 1–6. A week later, Fleming and
Scott Lipsky won the
Status Athens Open Challenger final because their opponents
Matthias Bachinger and
Benjamin Becker withdrew. At the beginning of June, Fleming/Hutchins won the
Aegon Trophy Challenger in Nottingham. At
Wimbledon, Fleming and
Ross Hutchins both had their best performances at a Grand Slam event in doubles, defeating 7th seeds
Mariusz Fyrstenberg and
Marcin Matkowski in the first round. Fleming and Hutchins won their first-ever five-set match together over
Dmitry Tursunov and
Grigor Dimitrov in the second round, on the way to the quarter-finals, where the pair lost a very tight five set thriller to Christopher Kas and Alexander Peya 4–6, 4–6, 7–6(7–2), 6–2, 4–6. They were the first British pair to reach the quarter-finals of the men's doubles tournament at Wimbledon since 1993. In the event, it was James Ward, Andy Murray and Jamie Murray who played, with Great Britain winning 4–1. Two months later at the
US Open, Fleming/Hutchins equalled their Wimbledon performance, once again reaching the quarterfinals. Despite a victory over 2nd seeds
Max Mirnyi and
Daniel Nestor in their second match, they ultimately lost in three sets to
Rohan Bopanna and
Aisam-ul-Haq Qureshi, blowing a match point opportunity in the deciding set. Then in September, at the
Davis Cup, Fleming helped
Great Britain win their promotion tie 5–0
against Hungary to advance to Group I playing in both the doubles, partnered by Ross Hutchins, and one of the dead singles rubbers. This was his first ever ATP Tour singles match win, against
Sebő Kiss 6–4, 6–3. James Ward was suffering the effects of his dramatic win over
Attila Balázs on Friday, so Fleming came in for the final rubber and recorded his first singles win in Davis Cup. Fleming/Hutchins later reached the semi-finals of the
Open de Moselle in Metz but lost to second seeds
Lukáš Dlouhý and
Marcelo Melo in three sets. Fleming did however finally win his third title after a two-year wait, at the
St. Petersburg Open, the last title he won back in 2009. They defeated
Michail Elgin and
Alexander Kudryavtsev in three sets 6–3, 6–7(5–7), [10–8]. This was Flemings first ATP title with Hutchins, and with the victory his world ranking rose to a career high rank of number 30 in the world. In December, Colin Fleming got married.
2012 At the start of the 2012 season, Fleming and Hutchins reached the third round of the
Australian Open for the first time, only to lose to the Bryan brothers, 4–6, 6–0, 2–6. This raised his ranking to a career high of no. 29 in the world. He also reached the quarterfinals of the
mixed event with
Liezel Huber. In February, Fleming and Hutchins were called for the
Davis Cup Europe/Africa Zone Group I tie against Slovakia. James Ward's loss and Dan Evans' win put the tie at 1–1 on the first day, then Fleming and Hutchins beat
Michal Mertiňák and
Filip Polášek 6–3 7–6 (7/4) 0–6 6–3. With Dan Evans winning his second match, Great Britain eventually won 3–2, making a fifth consecutive Davis Cup win under captain Leon Smith. Fleming won his second title with Hutchins and his first in the 2012 season at the
Delray Beach International Tennis Championships, defeating
Michal Mertiňák and
André Sá, 2–6, 7–6(7–5), [15–13]. This also raised his doubles ranking to a career high rank of no. 24 in the world. In April, Fleming and Hutchins were selected for the
Davis Cup Europe/Africa Zone Group I tie against Belgium. After
Josh Goodall and Dan Evans lost on the first day, Fleming and Hutchins made it three straight victories in the competition by beating Ruben Bemelmans and David Goffin 4–6, 7–5, 6–3, 6–4. Great Britain were eventually beaten 4–1, ending Leon Smith's 5 match winning run as Davis Cup Captain. Fleming was out of action for most of the clay court season because of a stress fracture in his tibia. Fleming/Hutchins lost in the first round of the Valencia ATP, so they now knew that they had failed their season-long goal of qualifying for the
Barclays ATP World Tour Finals, where the year's eight most successful doubles teams play. They were ninth in the doubles list and meant they could not beat the points totals of the pairs they needed to overhaul. At the
Paris Masters 1000, they reached the second round. In December, Ross Hutchins was diagnosed with
Hodgkin's lymphoma, and took an indefinite break from tennis while he recovered.
2013 . Fleming made a strong start to the 2013 season, winning the doubles title at the
Heineken Open with Brazilian partner
Bruno Soares, as Fleming's regular doubles partner
Ross Hutchins was out with illness. Fleming teamed up with fellow Scot
Jamie Murray for the
Australian Open, however they lost in the first round to
Michael Kohlmann and
Jarkko Nieminen. Following a break of around two weeks, Fleming then teamed up with Wimbledon champion
Jonathan Marray at the
Open Sud de France where they were the top seeds. The pair made it to the semifinals before losing in three sets to Sweden's
Johan Brunström, and
Raven Klaasen of South Africa. The following week, Fleming teamed up with
Rohan Bopanna of India, with whom he won his second title of the year at the
Open 13 in France, defeating Bopanna's former partner
Aisam-ul-Haq Qureshi and Dutchman
Jean-Julien Rojer in straight sets in the final. At
Indian Wells, Fleming teamed up with
Paul Hanley of Australia, with whom he made it to the quarterfinals before losing to Bruno Soares and
Alexander Peya. After a first round defeat in the
Miami Masters, partnered by Jonathan Marray, the two Brits returned to the UK for
Great Britain's first
Davis Cup fixture of the year. After
Russia took the first two singles rubbers, both in five sets, Fleming and Marray pulled one back against
Victor Baluda and
Igor Kunitsyn, defeating the duo in straight sets, 6–1, 6–4, 6–2 in only an hour and a half to keep the tie alive. They then lost in the opening round of the
Citi Open the following week. As their ranking was too low to compete in the
Rogers Cup, Fleming teamed up with fellow Scot and world number 2 singles player
Andy Murray for the first time. The pair reached their first ever
Masters Series final where they were beaten by Peya and Soares, the same partnership that Fleming had lost to in the Aegon International final. At the
US Open, Fleming returned to his usual partnership with
Jonathan Marray. They were seeded 12th for the tournament but faced a tough opening match which they came through in three sets. Another win followed to set up a 3rd round clash with 6th seeds
Rohan Bopanna and
Édouard Roger-Vasselin. They came through in straight sets to reach the quarter-final and equal Fleming's best ever US Open performance which he had achieved two years previously. They faced top seeds
Bob and Mike Bryan but narrowly lost out 6–7(7–9), 4–6. Fleming then partnered Andy Murray in the
Davis Cup World Group play-offs against Croatia. They pulled off a four set win against
Ivan Dodig and
Mate Pavić to help beat Croatia 4–1, and return to the World Group for the first time since 2008. This marked Fleming's eighth straight Davis Cup doubles victory. In November, the
Lawn Tennis Association announced a dramatic cut in elite player funding, with all financial support being withdrawn from Britain's doubles specialists and any singles players aged over 24, to reduce the number of supported players from 16 this year to just six in 2014.
2014 2014 saw Fleming resume his regular partnership with
Ross Hutchins after the latter returned from his illness. They lost their opening match of the season at the
Brisbane International and were also defeated at the
Heineken Open, before finally claiming a win at the
Australian Open where they defeated
Marinko Matosevic and
Michał Przysiężny. In late January, Fleming and Dominic Inglot were called to the Great Britain Davis Cup squad for the
World Group first round tie against the United States in
San Diego; Britain, making their return to the World Group after a five-year absence. Andy Murray and James Ward had won their singles matches, so team captain Leon Smith, rested Andy Murray for the doubles. Fleming and Inglot had not played a competitive match together since a junior tournament in Corfu 13 years ago, and so the world-beating Bryan brothers, posted a four-set win 6–2, 6–3, 3–6, 6–1 against FlemIng/Inglot. Later, Andy Murray secured his second singles victory; Great Britain winning the tie 3–1, to reach the Davis Cup quarter-finals for the first time since 1986. In April, Fleming, Andy Murray, James Ward and Dan Evans were selected for the
World Group quarter final against Italy, with Ross Hutchins as reserve. Fleming and Andy Murray won 6–3, 6–2, 3–6, 7–5 to secure a 2–1 lead, but Great Britain eventually lost 2–3. Fleming/Hutchins struggled to find form throughout the year but managed to turn things round in May by reaching the final of the
BMW Open, where they were defeated by
Jamie Murray and
John Peers. Fleming then teamed up with
Andre Sá to play the
Aegon Trophy in early June, where they were narrowly defeated in the final by
Chris Guccione and
Rajeev Ram. He then partnered
Marcin Matkowski to reach the quarterfinals of
Aegon Championships, before resuming his partnership with Hutchins to make the semifinals of the
Aegon International. They were then defeated in their opening match at
Wimbledon, and Fleming also lost in the second round of the
mixed doubles with fellow Scot
Jocelyn Rae. Fleming next competed at the
MercedesCup in July with
Mariusz Fyrstenberg, but they were defeated in the opening round. In September, Ross Hutchins decided to quit the Tour, soon after his return following treatment for Hodgkin's Lymphoma. That prompted Fleming to team up with Jonny Marray.
2015 Colin Fleming and Jonny Marray were narrowly beaten in the doubles final at the
Open 13 in Marseille. Looking for their first title together in their third final, Fleming and Marray went down 6–4 3–6 10–8 to Croatia's Marin Draganja and Henri Kontinen of Finland despite winning four more points. Having failed to get the results they wanted, Fleming decided to split from Jonny Marray. Fleming said breaking the news to Marray, a good friend, had been hard. After the grass season, Butorac announced he would be teaming up with another American, Scott Lipsky. Fleming didn't know who he would be playing with next, but a quick conversation "on Whatsapp" sorted out a partnership with
Treat Huey of the Philippines. Fleming said " "We messaged each other, figured out with our rankings we could get in together (to the US Open)". The Bryan brothers, in their inaugural
BB&T Atlanta Open appearance, defeated Fleming and
Gilles Müller in the final, 4–6, 7–6(2), 10–4. Muller, who had just completed a semifinal Saturday with over five hours on court, eventually succumbed to his fatigue latter in the finals match. At the US Open, Fleming/Huey beat fifth seeds Fabio Fognini & Simone Bolelli in the first round, Lleyton Hewitt & Sam Groth in the second round, and lost to Leonardo Mayer & João Sousa in the third round.
2016 For the first six months, Fleming mainly teamed up with
Jonathan Erlich, their best achievement being finalists at the
Marseilles Open in February. They also had semi final matches at the
Bucharest ATP 250 and
Queen's Club Championships. Persistent rain at
Wimbledon caused doubles matches to be restricted to best of three sets. In their last match together, Fleming/Erlich were beaten in the first round by
Jamie Murray and
Bruno Soares. Fleming now partnered
Mariusz Fyrstenberg, reaching the semi-final at the
Szczecin Open in September. A few days later, Fleming and his final doubles partner
Scott Lipsky were semi finalists in the
Moselle Open. In October, Fleming/Lipsky played for the last time at the
Stockholm Open winning their first round match, but being beaten in the next round, the quarter-finals.
2017 On 20 January 2017, Fleming announced his retirement from professional tennis to take up the new position of national coach for Tennis Scotland. ==Significant finals==