To start 2014, he raced the No. 21 RCM Motorsport Chevrolet Sonic alongside Thiago Camilo for the opening round of the Stock Car Brasil season at the Autódromo José Carlos Pace; the duo retired on the first lap due to a clutch failure. Di Grassi was retained by Audi for 2014 and was promoted to a full-time racing seat. He was selected to replace the retired McNish in the No. 1 Audi and shared it with Kristensen and Duval. Di Grassi started the season by retiring due to chassis damage arising from a crash at the 6 Hours of Silverstone, but recovered to finish second overall at Spa-Francorchamps. Although the No. 1 Audi's fuel injectors and turbocharger were replaced, di Grassi, Kristensen and Duval took second at Le Mans three laps adrift of André Lotterer, Benoît Tréluyer and Marcel Fässler's winning car. After another second position at the Circuit of the Americas, he clinched a hat-trick of fifth-places before ending with a podium at the season-closing 6 Hours of São Paulo. The trio's results ranked them ninth in the drivers' standings with 117 points.