- Apr 5 99th Grand National: 25/1 shot Bogskar ridden by Royal Air Force sergeant Mervyn Jones wins by 4 lengths from MacMoffat; last true Aintree GN before a 5-year break due to World War II
7th US Masters
Apr 7 7th US Masters Tournament, Augusta National GC: Jimmy Demaret wins the first of his 3 Masters titles, 4 strokes ahead of runner-up Lloyd Mangrum
- Apr 12 NFL cuts clipping penalty from 25 yards to 15 yards
- Apr 13 American athlete Cornelius "Dutch" Warmerdam, using a bamboo pole, becomes 1st man to pole vault 15 ft, at University of California, Berkeley
- Apr 13 Stanley Cup Final, Maple Leaf Gardens, Toronto, Ontario: New York Rangers beat Toronto Maple Leafs, 3-2 for 4-2 series victory; Rangers last Cup win for 54 years
- Apr 15 44th Boston Marathon won by Gérard Côté of Canada in 2:28:28.6; first of 4 wins in the event
Only Opening Day No-Hitter
Apr 16 Cleveland Indians pitcher Bob Feller hurls the first and only Opening Day no-hitter in MLB history; beats Chicago WSWhite Sox, 1-0 at Comiskey Park
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