April 13
1957 — The Boston Celtics capture their first NBA championship as rookie Tommy Heinsohn scores 37 points and grabs 23 rebounds in a 125-123 double-overtime victory over the St. Louis Hawks in Game 7.
1970 — Billy Casper wins the Masters with a five-stroke playoff victory over Gene Littler.
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1972 — The first player strike in baseball history ends and the season is set to start April 15.