Rast debuted at the 2014 24 Hours of Le Mans with a Sébastien Loeb Racing Oreca-Nissan, finishing fourth in the LMP2 class. In 2015, he competed at two rounds of the FIA World Endurance Championship with a factory Audi R18 e-tron quattro, finishing fourth overall at the 6 Hours of Spa and seventh at the 24 Hours of Le Mans. In 2016, he raced full-time for G-Drive with an Oreca-Nissan LMP2, claiming a win at Bahrain and a second place at the 24 Hours of Le Mans and two third-place finishes at Silverstone and Austin.