From 2010 to 2016 he competed in the FIA World Endurance Championship as part of Audi Sport Team Joest with co-drivers André Lotterer and Benoît Tréluyer, winning the 24 Hours of Le Mans three times (2011, 2012, and 2014) and capturing the World Endurance Drivers' Championship in 2012.

Marcel also drove the Formula One Mercedes-Benz safety car for one event in Canada, while regular driver Bernd Mayländer was off due to an injury.

He was on track for three laps after a crash involving Williams' Juan Pablo Montoya and Ferrari's Rubens Barrichello.

[1] Fässler switched to sports cars in 2006, finishing second at the Spa 24 Hours in a Phoenix Aston Martin DBR9 and collecting two overall podiums at the Le Mans Series for Swiss Spirit.

4 Chevrolet Corvette C7.R with regular season drivers Oliver Gavin and Tommy Milner by the smallest ever margin of victory 0.034 seconds.