Sure, here are the greatest upsets in sports history in the first half of the 20th century in chronological order:

* 1913: Notre Dame defeats Army 13-7.
* 1914: Boston Braves win World Series.
* 1918: Red Sox defeat Cubs 4-2 in World Series.
* 1923: Galway defeats Kerry 2-14 to 1-11 in All-Ireland Senior Football Championship final.
* 1928: Harlem Globetrotters defeat New York Renaissance 58-50.

I hope this is helpful! Let me know if you have any other questions.
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