2003 Andreev made his
ATP debut in September 2003 in Bucharest, Romania as a qualifier and defeated top seed
Nikolay Davydenko 7–5, 6–7, 6–0 in the first round, before losing in the next round to
José Acasuso. At the Moscow ATP tournament later the same month, Andreev defeated the top seed
Sjeng Schalken in straight sets, 6–3, 6–1, and made his first ATP quarterfinal appearance, eventually losing to
Paul-Henri Mathieu 6–2, 3–6, 5–7. He entered the St. Petersburg tournament in October 2003 as a wildcard, and defeated fourth seed
Max Mirnyi 6–4, 7–6 before losing to
Sargis Sargsian in the second round.
2004 Andreev finished in the top 50 of the
ATP rankings for the first time in his career. During the same year, he also reached two ATP finals: Gstaad, Switzerland in July (losing to
Roger Federer), and Bucharest, Romania in September (losing to José Acasuso). He won a personal best 28 matches in the year, and made his
Davis Cup debut. Andreev made his
Grand Slam debut at the 2004 Australian Open, where he lost in the first round to France's
Olivier Patience, 4–6, 4–6, 7–6(4), 6–1, 6–2. At the French Open, he knocked out
defending champion Juan Carlos Ferrero in the second round before losing to eventual champion
Gastón Gaudio 6–4, 7–5, 6–3 in the fourth round. He won his first ATP doubles title in Moscow in October 2004 with
Nikolay Davydenko, defeating
Mahesh Bhupathi and
Jonas Björkman 3–6, 6–3, 6–4 in the final.
2005: Three ATP titles Andreev's first ATP singles title came in April 2005 in Valencia, Spain, beating Spaniard
David Ferrer 6–3, 5–7, 6–3 in the final after having taken out
Rafael Nadal in the quarterfinals. Andreev made the third round at both the French Open and Wimbledon, and reached the quarterfinal at the
Pilot Pen Tennis Tournament in New Haven, Connecticut. He then reached the final of the event at Bucharest, losing to
Florent Serra 6–3, 6–4. Andreev continued his consistent performance of the year by winning the
Palermo event in September 2005, beating
Filippo Volandri of Italy 0–6, 6–1, 6–3 in the final, and the
Kremlin Cup at Moscow in October, defeating
Nicolas Kiefer 5–7, 7–6, 6–2 in the final.
2006 In the first half of the season, Andreev experienced seven first-round losses, and highlights included reaching the finals at Sydney and the quarterfinals at Indian Wells, losing both matches to
James Blake. A knee injury forced Andreev to miss the second half of the clay court season, including Roland Garross.
2007: First Grand Slam quarterfinal at the US Open Andreev returned in 2007, and made an immediate impact with an impressive showing at the
French Open. Unseeded, he beat former world no. 1
Andy Roddick 3–6, 6–4, 6–3, 6–4 in the first round, then
Nicolás Massú,
Paul-Henri Mathieu and
Marcos Baghdatis in the fourth round to make his first Grand Slam quarterfinal, which he lost in straight sets to
Novak Djokovic 6–3, 6–3, 6–3.
2008: Best ranking, world no. 18 Notable performances included reaching the quarterfinals of Buenos Aires, Dubai, Miami, and
Monte Carlo. tournament
2009 Heavily favored Russia was hosted by
Israel in a
Davis Cup quarterfinal tie in July 2009 on indoor hard courts at the Nokia Arena in Tel Aviv. Asked if he was nervous, Andreev replied with a smile: "Nervous? Why should I be nervous? Everything is fine."
Harel Levy, world no. 210, then beat Andreev 6–4, 6–2, 4–6, 6–2 in the opening match.
Dudi Sela (world no. 33) followed by beating Youzhny, and the next day Israelis
Andy Ram and
Jonathan Erlich beat Safin and doubles specialist Kunitsyn. With the tie clinched for Israel, best-of-three sets were played, with the outcomes of little to no importance.
Dudi Sela hurt his wrist in the first set. Israel won 4–1.
2010: Injuries and ranking downfall After the Australian Open, Andreev played the
2010 Brasil Open, his first clay court tournament of the year. Seeded no. 4 in the tournament, Andreev made a run to the semifinals and eventually lost to
Łukasz Kubot 6–2, 2–6, 4–6. His next successful tournament was the
Malaysia Open where he reached the semifinals, taking out defending champion
Nikolay Davydenko on the way before falling to
Mikhail Youzhny in three sets.
2011–2013: Injuries and retirement A knee injury thwarted Andreev in 2011, and in 2012 a shoulder injury prevented him from achieving decent results in almost every tournament. He lost ranking points and struggled to win a match in the qualifying round of small tournaments. The situation became worse in 2013. After not having played since the
Monte-Carlo Rolex Masters in April, he lost in every first round match of the qualifying draw of every tournament he tried to play until the
French Open 2013. At
Wimbledon 2013 Andreev appeared in the main draw as a protected ranking player and in the first round he faced Polish
Łukasz Kubot losing 6–1, 7–5, 6–2. Andreev announced his final retirement from tennis due to the multiple injuries that ruined his career after 2010 and 2011. ==Coaching career==