For 1994 Wendlinger was retained as Mercedes made their official return to Formula 1, buying a stake in Ilmor and becoming the team's engine suppliers. Heinz-Harald Frentzen arrived in place of Lehto. The season started well for Wendlinger; he scored a point in the first race of the year at Interlagos and drove to fourth place in the San Marino race, an event marred by the deaths of both Wendlinger's countryman Roland Ratzenberger and the 3-times world champion Ayrton Senna.