In 2015, he broke the European record and won the silver medal at the International Paralympic Committee (IPC) Swimming World Championship in Glasgow.

One year later, in December 2006, just outside the swimming pool where he had spent half of his life as a polo player, he lost the control of his motorcycle due to excessive speed.

[1] Tsapatakis's senior international debut was in 2009 with a bronze medal when he competed at the IPC Swimming European Championships in Iceland.

[6][7] In August, 2014 Tsapatakis attended the IPC European Championship in Eindhoven, the Netherlands, scoring 1:39.23 in 100m breaststroke SB4 classification and winning the silver medal.

[2][10] Tsapatakis set a new national record in 50m Butterfly Stroke at IPC Swimming European Championships in Funchal, Portugal.

[12][13] At the 2017 IPC Swimming World Championships in Mexico City, Tsapatakis earned one more bronze medal with a score 1:45.12 in men’s 100m breaststroke SB4 final.

[17] At the 2023 Para Swimming World Championships in Manchester, UK, Tsapatakis won again the gold medal in Men's 100m breaststroke SB4 classification, completing the race in 1:39.53.