The Saturday was cold and wet. In the morning, Harvey's Alvis broke its oil-pump and could not take the start. The remaining eleven cars could be lined up in a single row across the wide Railway Straight. In the heavy rain, Bourlier could not start his Delage, leaving his mechanics working on the car as the flag dropped. Materassi jumped into the lead, yet by the second lap, Bourlier had caught up and taken the lead. After only ten of the 125 laps both Thomas cars had dropped out and Eyston was having the first of many stops for sparkplugs. The Delage team had taken control, with Divo leading Bourlier and Benoist. Around the halfway point, most drivers stopped to refuel but Conelli, running in fourth, ran out of petrol and spent half an hour pushing his car back to the pits in the lashing rain. Chiron inherited his place but was already six laps behind the leader. Louis Delage issued team orders for his cars to finish in numerical order, which by opportune pit-stops was what happened - with Benoist winning from Bourlier and Divo. Chiron finished the 125 laps nearly half an hour later, and Materassi was flagged off still a further seven laps back.
