Lemaitre then combined with Jimmy Vicaut, Pierre-Alexis Pessonneaux, and Martial Mbandjock in the 4 × 100 m relay final to finish first ahead of Italy and Germany in a time of 38.11 s. At the IAAF World Challenge's Rieti Meeting in Rieti, Italy on 29 August 2010, Lemaitre competed in the 100 m. In that event, he equalled his personal best in his heat with a time of 9.98 s, and improved on it in the final with a time of 9.97 s (reaction time 0.199 s).