April 16 – At Wrigley Field, Burt Hooton of the Chicago Cubs no-hits the Philadelphia Phillies 4–0. April 21 – At Arlington Stadium, Frank Howard hits the first home run in Texas Rangers history, a solo shot against Clyde Wright of the California Angels. May 11 – The San Francisco Giants trade Willie Mays to the New York Mets for minor league pitcher Charlie Williams and cash. May 14 – In front of a Mother's Day crowd of 35,000 in New York's Shea Stadium, Willie Mays makes a triumphant return to New York with the Mets, hitting a game-winning home run against his old teammates (the Giants). He scores in the 1st inning on Rusty Staub's grand slam and his solo homer in the 5th inning snaps a 4–4 tie. The final score: Mets 5, Giants 4. May 16 – Philadelphia Phillies rookie outfielder Greg Luzinski blasts a 500-foot home run off the Liberty Bell at Philadelphia's Veterans Stadium. May 28 – The Milwaukee Brewers fire manager Dave Bristol, replacing him with Del Crandall. Coach Roy McMillan takes over until Crandall arrives and guides the team to a 4–1 loss to the Boston Red Sox. June 18 – The U.S. Supreme Court rules 5–3 in favor of Major League Baseball in the lawsuit brought by Curt Flood, upholding the reserve clause. June 24 – In the first game of a doubleheader between the visiting Auburn Phillies and Geneva Senators of the Class A New York–Pennsylvania League, Bernice Gera becomes the first woman to umpire a professional baseball game. She resigns between games after being verbally abused by some spectators and by some involved in the game. July July 2 – San Francisco's Willie McCovey hits his 14th career grand slam home run to pace the Giants 9–3 win over the Los Angeles Dodgers. Pitcher Randy Moffitt wins his first major league game and receives a congratulatory telegram from his sister Billie Jean King, who is playing at Wimbledon. July 4 – For the second time in his career, Tom Seaver of the New York Mets has a no-hitter broken up in the ninth. The bid is foiled in the first game of a doubleheader against the San Diego Padres at Shea Stadium by a Leron Lee single with one out, the only hit Seaver will allow in a 2–0 Met victory. Seaver had a bid for a perfect game broken