Formula 1 world championship switches to F2 rules after Alfa Romeo withdrawal • British one-two in Monte Carlo Rally, Sidney Allard leading home Stirling Moss • Lance Macklin wins International Trophy in front of huge crowd • Monaco Grand Prix held to sportscar rules for first time, Luigi Fagioli dies after accident exiting the tunnel in practice • Ferrari enters the Indy 500, but Troy Ruttmann's wins with proven Offenhausen power • Pierre Levegh drives solo for 23 hours at Le Mans before his Talbot's engine expires when in the lead • Mercedes "gullwing" 300SL triumphs at La Sarthe with Hermann Lang and Fritz Riess • Karl Kling's similar car survives an impact with a vulture to win Carrera Panamericana
- Alberto Ascari takes the first of six consecutive grand prix wins in '52 at Spa, on his way to the title
- Hermann Lang and Fritz Riess win Le Mans following Pierre Levegh's retirement after 23 hours solo
- Stirling Moss (Sunbeam-Talbot) finishes runner-up in the Monte Carlo Rally, behind Sidney Allard
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