- May 18 Philadelphia Athletics rout Detroit Tigers, 24-2 at Shibe Park; Tigers use amateurs in protest at Ty Cobbs suspension from the game
- May 19 AL President Ban Johnson tells Tigers if they continue protest of Ty Cobb's suspension, they will be banned from baseball
- May 28 Australian cricket spin bowler Jimmy Matthews takes 2 hat-tricks on same day in Triangular Tournament v South Africa at Old Trafford (3/16, 3/38); only player to achieve the feat
- May 30 Indianapolis 500: Joe Dawson in the American-manufactured, 4-cylinder National, wins in race record 6:21:06; time is 21:02 faster than previous 1911 record
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