A backstroke specialist, he won silver in the 200 m backstroke at the 2013 and 2015 World Championships.[3] In the short course World Championships, he has 3 golds (2012, 2014 and 2016) and 1 bronze (2018) in this event, as well as a silver medal in the 100 m backstroke from the 2014 World Short Course Championships.[3]
European Championships
At the European Long Course Swimming Championships, Kawęcki has also won 3 gold medals (2012, 2014 and 2016) in the 200 m backstroke, along with a silver medal in the event in 2018.[3]
In the European Short Course Championships, Kawęcki has 6 gold medals in the 200 m backstroke (2011, 2012, 2013, 2015, 2019 and 2021) and 2 silver medals (2009, 2017), alongside 2 gold medals in the 100 m backstroke event (2011 and 2015).[3]
International Swimming League
In 2019 he was a member of the inaugural International Swimming League representing the Cali Condors, who finished third place in the final match in Las Vegas, Nevada in December. Kawecki scored points in all 3 backstroke events as well as the medley relay for the Condors throughout the season.[4]