Wendl was born on 16 June 1987 in Aachen, Germany. He began competing in the luge in 1993; and became a part of the national team in 2005, luging as a front. At the 2008 FIL World Luge Championships in Oberhof, Germany, he won a silver medal; and at the FIL European Luge Championships 2010 in Sigulda, Wendl won a silver medal in men's doubles and a bronze medal in the mixed team events. He won a gold medal at the FIL World Luge Championships 2013, in Whistler, Canada. Wendl competes in the double with Tobias Arlt, and is the front. Their nickname when competing together is "The Bayern-Express" and "The Two Tobis".