Jones was selected for the Australian team at just 14 years of age, qualifying in the 100-metre breaststroke by winning the event at the Australian Championships in May 2000 in Sydney, ending the international career of former world champion
Samantha Riley.
2000 Olympics Jones swam a personal best in the final at the
Sydney Olympics to claim an unexpected silver medal behind American
Megan Quann. She also combined with
Dyana Calub,
Petria Thomas and
Susie O'Neill in the 4×100-metre medley relay to win silver, again behind the Americans. Jones left school aged 15 to concentrate on swimming. At the
2001 World Aquatics Championships in Fukuoka, Japan, Jones was now one of the established swimmers and expected to win medals. She finished second to China's
Luo Xuejuan. The competition also marked her international debut in the 200-metre breaststroke, where she came fourth place (2:25.46). She also collected a gold in the medley relay alongside Calub, Thomas and
Sarah Ryan, the first time that the US women had been beaten at world or Olympic level in this event, excluding the systemically doped East German and Chinese teams. In 2002, Jones claimed her first titles on the international arena, claiming the breaststroke double at the
2002 Commonwealth Games in Manchester, England. Australia also won the medley relay. At the
2003 World Aquatics Championships in Barcelona, Jones set a world record in the semifinals of the 100-metre breaststroke (1:06.37). However, she succumbed to nerves in the final and came third, with Luo again winning the event. She also achieved a silver in the 200-metre breaststroke in Barcelona, behind
Amanda Beard in (2:24.33). She collected a bronze in the medley relay. In the month leading up to the
Athens Olympics, Jones set a world record (2:22.96) in the 200-metre breaststroke in a meet in Brisbane, Australia. This led to high expectations of an even better performance in Athens, as Jones had not been rested prior to swimming the world record. However, it was reclaimed by Beard at the US Olympic trials only a few days later.
2004 Olympics In Athens, Jones was again the quickest qualifier of the
100-metre breaststroke, after setting an Olympic record (1:06.78) in the semifinals, which was almost two seconds clear of the then second fastest swimmer in the event's history,
Amanda Beard. However, in the final race she finished in the bronze position. In the
200-metre breaststroke, she attempted to take an attacking approach, but faded in the last 50 metres and was pipped to the wall by Amanda Beard, winning silver. Australia went on to win the 4×100-metre medley relay, giving Jones her first Olympic gold. Jones' world record in the 100-metre breaststroke was broken at the
2005 World Aquatics Championships in Montreal, Canada by Jessica Hardy of the United States in 1:06.20, again in the semifinal. However, this time the expectations turned to Hardy and Jones turned the tables and beat her to the wall, breaking through for her first win at world or Olympic level. She also broke the world record for the 200-metre breaststroke (2:21.72), on 29 July 2005. In the process she won the gold medal, leaving her rivals more than six metres behind. For her efforts she was named by
Swimming World magazine as the
Female World Swimmer of the Year in 2005. The changes which occurred in 2005 continued to pay off at the Australian Commonwealth Games Swimming Trials in early 2006 where Jones broke her personal best time in the 50-metre breaststroke (30.85) and took 1.18 seconds off her previous world record in the 200-metre breaststroke (2.20:54). On Day 5 of the Australian Nationals Jones swam a world record in the 100-metre breaststroke final. Jones won the Australian championship in a time of 1:05.71 which lowered the previous mark by 0.49 of a second. Jones completed a clean sweep of the breaststroke events (50-, 100- and 200-metre) at the
2006 Commonwealth Games—the only time this has been achieved in the breaststroke events in the games' history. In the butterfly events (50-, 100- and 200-metre) at the 2002 Manchester Games,
Petria Thomas was the first swimmer in Commonwealth Games history to complete a clean sweep. The 50-metre events were introduced at the Manchester Games. In the 50-metre breaststroke, an event she had only recently begun competing in, she defeated the reigning world champion and world record-holder
Jade Edmistone. She later won another gold in the 200-metre breaststroke and completed the sweep with the gold medal in the 100-metre in a world record time of 1:05.09 – an effort that saw her own world record reduced 0.62 of a second and was declared "Beamonesque" by aquatics journalist Craig Lord, a reference to
Bob Beamon's legendary long jump at the Mexico City Olympics. A fourth gold medal in world record time in the 4×100-metre medley relay with
Sophie Edington,
Jessicah Schipper and
Libby Lenton rounded off her Commonwealth Games. In 2007, she competed in the World Championships and won the 100-metre breaststroke, 200-metre breaststroke, and 4×100-metre medley relay, setting a world record in the relay. She also won silver in the 50-metre breaststroke. She then left Brisbane and Widmer to move to Melbourne to train under
Rohan Taylor, so that she could live with her fiancé
Marty Pask, an
Australian rules footballer with the
Western Bulldogs. Her dissolution of a successful partnership raised eyebrows and many questioned whether putting her personal life ahead of a proven competitive formula would backfire in the pool. In early 2008, she won the breaststroke double at the
2008 Australian Swimming Championships to qualify for the Beijing Olympics. Although missing the
World Short Course Championships in Manchester due to the preparation for the 2008 Beijing Olympics she broke her own world record over 100-metre breaststroke (SC) in 1:03.72 at the Telstra Grand Prix in Canberra.
2008 Olympics Jones won gold at the
2008 Beijing Olympics in 100-metre breaststroke, touching the line a full body length ahead of her rival. Her time of 1:05.17 was 1.66 seconds faster than the American silver medalist
Rebecca Soni. While she was the favourite to win in the 200-metre breaststroke, she was beaten by Soni, who won gold in world record time. Jones took the silver. She also won a gold medal in the 4×100-metre medley relay, with the Australian team breaking the previous world record by three seconds. Jones was awarded the Telstra Swimmer Of The Year award as part of the year's international all-star team, in Sydney in October 2008. At the
World Cup meeting at Berlin, Germany, Jones set world records in the 100- and 200-metre breaststroke (short course). Jones had a low-key year and opted out of the
2009 World Championships.
2012 Olympics Jones confirmed that she was aiming for the 2012 Olympics in London and competed at the Pan Pacific Championships and the Commonwealth Games in 2010. Jones confirmed her place on these teams by winning the 50-, 100- and 200-metre breaststroke at the 2010 Telstra Australian Swimming Championships. At the
Pan Pacific Swimming Championships in Irvine, California, in 2010 Jones collected three silver medals and a bronze. She competed in the 50-metre
breaststroke (bronze) 100-metre breaststroke (silver), 200-metre breaststroke (silver), and the 4×100-metre medley relay (silver) events. In all four of events, she was behind the Americans; in the 50-metre she was behind
Jessica Hardy and fellow Australian
Leiston Pickett, and in the 100- and 200-metre she finished behind
Rebecca Soni. After earning selection to compete at the 2012 London Olympics, Jones became the first Australian swimmer to compete at four Olympic games. Together with
Emily Seebohm,
Alicia Coutts and
Melanie Schlanger, she won a silver medal for Australia in the
4×100-metre medley relay.
Retirement Jones confirmed her retirement from swimming on 16 November 2012. In 2015, Jones appeared in the Australian version of ''
I'm a Celebrity...Get Me Out of Here! (Australian TV series)''. She was, however, voted off the show in the first week. In January 2016, Jones graduated from the Nutrition Coach course at the
Australian Institute of Fitness. She believes she is "so much more informed now" than when she was swimming in terms of good nutrition. ==Recognition==