Sunbeam’s Henry Segrave led the first three laps from his advantageous spot on the front row (the grid was decided by ballot) but his day was to be ruined by a constant misfire caused by what later transpired to be a duff magneto; his fastest lap was small consolation for finishing fifth. Fiat’s mercurial Pietro Bordino took up the running, but he was gradually hauled in, and then overhauled, by Antonio Ascari’s P2. Bordino fought back, but the strain was too much and he retired with failing brakes at half-distance in this 500-mile race.
Ascari looked set for victory until a cracked cylinder block put him out on the last lap. Fortunately for Alfa Romeo, his burly team-mate Giuseppe Campari stepped into the breach and beat the Delages of Albert Diva and promising newcomer Robert Benoist.
It had been a dramatic day. But had you looked past all the banner headlines you would have noticed a footnote that would eventually become a chapter heading. Count Louis Zborowski, with Sammy Davis as his riding mechanic, had done a steady job in his American-built Miller 122 until its front axle broke on lap 17. The significance? His was the first-ever grand prix entry by a privateer as opposed to a manufacturer. Within two seasons this would become the norm — Bugatti, with help from Alfa Romeo, would see to that.