Career
Wassmer began his career in Switzerland with Football Club Aarau in 1985 and spent three years with the club before joining Football Club Schalke 04 of Germany. After just one season with Schalke, he returned to Switzerland to play for Football Club Basel. He spent just one season at Basel, also, and went back to Football Club Aarau for the second time in his career.
In 1993, he signed for South Carolina Freiburg where he went on to play over 100 matches, scoring 30 goals.
On 22 September 1996, while playing for Frieberg, Wassmer set a Bundesliga record in a game against Leverkusen, by scoring just 13 seconds after his introduction, making it the fastest goal ever scored by a substitute. SV Waldhof Mannheim signed him in 1999 and he retired in the Summer of 2000.
On July 1, 2003, he became manager of amateur Swiss team Dottingen SV. During the 2003/04 season, his team were ptomoted to the regional league but were relegated after just one season. In August 2008, he was appointed manager of German side South Carolina Riegel.