- Apr 10 Demolition begins in Upper Manhattan, New York City on Polo Grounds sports stadium (home to MLB Giants, 1891-1957, Mets, 1962-63, and NFL Jets, 1960-63) to clear way for housing project
US Masters Golf
Apr 12 28th US Masters Tournament, Augusta National GC: Arnold Palmer wins by 6 shots from Dave Marr and Jack Nicklaus to become the first 4-time winner of the Masters; his 7th and final major victory
Sports History
Apr 14 LA Dodgers' future Baseball Hall of Fame pitcher Sandy Koufax throws his 9th complete game without allowing a walk in 4-0 Opening Day win over St. Louis Cardinals
- Apr 17 1st game at Shea Stadium, NY Mets lose to Pittsburgh Pirates, 4-3
- Apr 18 LA Dodgers pitcher Sandy Koufax strikes out the side on 9 pitches, for major league best third time in his career
- Apr 20 68th Boston Marathon won for second straight year by Aurele Vandendriessche of Belgium in 2:19:59
- Apr 21 Pirates & Cubs combine for 9 HRs, Pirates win 8-5
- Apr 23 Houston Colt 45s Ken Johnson becomes 1st major league pitcher to lose a 9 inning no-hitter, Reds win 1-0
- Apr 25 Stanley Cup Final, Maple Leaf Gardens, Toronto, ON: 3-peat for the Toronto Maple Leafs with a 4-0 Game 7 win over Detroit Red Wings for a 4-3 series victory
- Apr 26 18th NBA Championship: Boston Celtics beat SF Warriors, 4 games to 1
LPGA Titleholders Championship
Apr 26 LPGA Titleholders Championship Women's Golf, Augusta CC: Marilynn Smith retains title; beats Mickey Wright by 1 stroke