- May 9 56th Preakness: George Ellis aboard Mate wins in 1:59
- May 10 Golf ball size hail falls in Burlington, New Jersey
- May 16 57th Kentucky Derby: Charley Kurtsinger on Twenty Grand wins 2:01.8
- May 22 1931 George End introduces “Genuine Diamondback Rattlesnake with Supreme Sauce” in a can, by his Florida Products Corporation; the popular item ceases production in 1944 after when the owner dies, a victim of one snake's revenge [1]
- May 30 Indianapolis 500: Defending champion Billy Arnold leads for 155 laps before axle trouble; Louis Schneider leads final 34 laps accompanied by riding mechanic Jigger Johnson
Baseball History
May 30 Phillies Chuck Klein homers off Ben Cantwell (Braves) in both ends DH
36th French Championships
May 31 36th French Championship Women's Tennis: Cilly Aussem of Germany beats England's Betty Nuthall 8-6, 6-1 for the first of 2 major titles in 1931
36th French Championships
May 31 36th French Championships Men's Tennis: Jean Borotra wins his only home title; beats fellow Frenchman Christian Boussus 2-6, 6-4, 7-5, 6-4
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions