1933 - Although they lose to St. Louis 12-3, the Giants clinch the pennant when runner-up Pittsburgh splits a pair in Philadelphia.
1961 - The Giants clobber Warren Spahn for four home runs, one of them a grand slam by Willie Mays, and then rally in the 8th and 9th to top the Braves, 11-10. The two teams combine for eight home runs and 57 total bases, but the short ball wins it -- Harvey Kuenn's tie-breaking single in the 8th, and Ed Bailey's sacks-full single in the 9th.
1998 - The Giants score seven runs in the 3rd inning, and six more in the 4th, as they demolish the Dodgers by a score of 18-4. Bill Mueller and Jeff Kent bang grand slams in the two frames, just the 2nd time (April 26, 1970) in Giants history that two players have hit grand slams in a game.
Joe Morgan was born on this day in 1943. He didn't spend much time with the Giants, but I'll always remember the home run he hit in 1982 to knock the Dodgers out of the NL West race. :)