Career
Stoss qualified for the men"s 200 m backstroke at the 2008 Summer Olympics in Beijing, by eclipsing a FINA A-standard entry time of 1:59.27 from the European Swimming Championships in Eindhoven, Netherlands. He challenged seven other swimmers on the fourth heat, including three-time Olympians Răzvan Florea of Romania, Simon Dufour of France, and his teammate and two-time Olympic silver medalist Markus Rogan. He raced to fifth place and nineteenth overall by fifteen hundredths of a second (015) ahead of Japan"s Takashi Nakano with a time of 1:59.44.
Stoss also tied his overall position with Hungary"s Roland Rudolf.
Four years after competing in his first Olympics, Stoss qualified for his second Austrian team, as a 26-year-old, at the 2012 Summer Olympics in London by clearing a B-standard entry time of 2:00.89 in the men"s 200 m backstroke. Stoss raced to second place in heat 1 by a single second behind Turkish swimmer and six-time Olympian Derya Büyükuncu with a second-slowest time of 2:02.91.
Stoss failed to advance into the semifinals, as he placed thirty-fourth overall in the preliminary heats.
