2008 Olympics Coutts competed at the
2008 Summer Olympics where she ended up fifth in the
200-metre individual medley. 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. 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.
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.
2016 Olympics At the
2016 Summer Olympics, Coutts finished fifth in the final of the 200 m individual medley. In October 2016, she announced her retirement. ==Career best times==