2008 Olympics

Coutts competed at the 2008 Summer Olympics where she ended up fifth in the 200-metre individual medley.^[1]

2010 Commonwealth Games and Pan Pacs

At the Pan Pacs, she took two relay silver medals and bronze in the 100 m butterfly.

At the 2010 Commonwealth Games, she won the 100-metre butterfly, 100-metre freestyle, 200-metre individual medley, as well as contributing to the 4×100-metre freestyle relay and 4×100-metre medley relay, bringing her total haul to 5 gold medals. She carried the Australian flag at the Commonwealth Games closing ceremony.^[2] She was named the Telstra Australian Swimmer of the Year for 2010.

At the 2011 Australian Championships which doubled as the World Championship Trials, seeking to pick up her first national title. On night two, she doubled up, taking the 100-metre butterfly by a clear margin, as well as the 200-metre individual medley, beating Olympic champion Stephanie Rice by approximately an arm's length. She took 6th place in the 200-metre freestyle. On night six, she took gold in the 100-metre freestyle, winning by a clear margin over Yolane Kukla. In June, she took 3 gold at the Barcelona leg of the Mare Nostrum Series, downing the meet record of the 100-metre butterfly as well as the 200-metre individual medley in a personal best time.

2011 World championships and Olympic Trials

At the 2011 World Championships on night two, Coutts took silver medals in the 100-metre butterfly and 200-metre individual medley. She swam the butterfly leg of the 4×100-metre medley relay, capturing a bronze medal.^{[citation needed]}

At the 2012 Olympic Trials, she won the 100-metre butterfly holding off Jessicah Schipper down the stretch and stopping Libby Trickett's attempt to defend her Olympic title in that event. She took silver in the 200-metre medley, booking another individual spot. She later placed in the top 6 in the 100-metre freestyle, gaining a spot on the 4×100-metre freestyle relay. On the final night she collected silver in the 4×100-metre medley relay.^{[citation needed]}

2012 Olympics

On night one, she collected gold in the 4×100-metre freestyle relay with Cate Campbell, Brittany Elmslie and Melanie Schlanger setting a new Olympic record in the process. On night two, she collected a bronze in the 100-metre butterfly, she became the 8th fastest of all time. Night 4 she got a silver in the 200-metre individual medley becoming the 5th fastest of all time. On night 5, she anchored the 4×200-metre freestyle relay team to silver, recording a 200-metre split time of 1:56.12, 1.6 seconds quicker than her official personal best. On the final night, she collected a silver in the 4×100-metre medley relay, bringing her medal total to 5 in a single Olympic Games.

At the 2013 Australian Championships (which doubled as the qualifiers for 2013 World Aquatics Championships), Coutts won gold the 50 and 100-metre butterfly and the 200-metre individual medley, silver in the 50-metre backstroke and bronze in the 50-metre breastroke and 100-metre freestyle.

2013 World Championships

At the World Championships, she collected silver medals in the 100-metre butterfly, 200-metre medley, 4x100-metre freestyle relay, 4×200-metre freestyle relay, 4×100-metre medley relay.^[4]

2016 Olympics

At the 2016 Summer Olympics, Coutts finished fifth in the final of the 200 m individual medley.^[5] In October 2016, she announced her retirement.^[6]