- May 4 1st legal Sunday baseball game in NYC, 35,000 watch the Phillies beat the NY Giants 4-3
- May 8 Appingedam soccer team forms
- May 10 45th Kentucky Derby: Johnny Loftus aboard Sir Barton wins in 2:09.8 on way to first Triple Crown
- May 11 Cincinnati Reds pitcher Hod Eller no-hits St Louis Cardinals, 6-0 at Redland Field, Cincinnati
Johnson - Quinn Pitching Duel
May 11 Washington Senators future Baseball Hall of Fame ace Walter Johnson pitches 12 scoreless innings in a famous 0-0 duel with Jack Quinn of the NY Yankees at the Polo Grounds
- May 12 New York Yankees and Washington Senators play second straight extra inning tie, 4-4 in 15 innings at the Polo Grounds; 0-0 in 12 the previous day
- May 14 44th Preakness: Johnny Loftus aboard Sir Barton wins in 1:53 on way to first Triple Crown
- May 15 Brooklyn Dodgers score 10 runs in 13th to beat Reds 10-0
Stengel Releases Sparrow
May 25 Casey Stengel releases a sparrow from under his baseball cap
- May 31 Indianapolis 500: Howdy Wilcox accompanied by riding mechanic Leo Banks win; driver Arthur Thurman dies in a crash on lap 45; lap 96, Louis LeCocq and riding mechanic Robert Bandini wrecked in turn 2, both burned to death
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions