- May 1 Chicago White Sox outfielder Herm McFarland hits first grand slam in American League history in 19-9 win at home against Detroit; Tigers commit 12 errors
- May 9 Cleveland's Earl Moore no-hits Chicago White Sox 9 inn but loses in 10th 4-2
- May 23 35th Belmont: H Spencer aboard Commando wins in 2:21
- May 28 26th Preakness: Fred Landry aboard The Parader wins in 1:47.2
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