There seems to have been 14 games in total that have been replayed. The most famous is the 'pine tar' game. Thee were three in the seventies, only one in the fifties and sixties and a handful before that.
In 1983 the Royals and Yankees met on July 24, 1983 at Yankee Stadium. With his team trailing 4–3 in the top half of the ninth inning, George Brett of the Royals hit a 2-run home run to give his team the lead.
However, Yankees manager Billy Martin, who had noticed a large amount of pine tar on Brett's bat, requested that the umpires inspect his bat. The umpires ruled that the amount of pine tar on the bat exceeded the amount allowed by rule, nullified Brett's home run, and called him out. As Brett was the third out in the ninth inning with the home team in the lead, the game ended with a Yankees win.
The Royals protested the game, and American League president Lee MacPhail upheld their protest and ordered that the game be restarted from the point of Brett's home run. The game was restarted on August 18 and officially ended with the Royals winning 5–4.
The last successful protest was in 1986 for a game between the Cards and Pirates. St Louis was winning 4-1 in the top of the sixth inning when the game was called for rain after two delays. But the delays had been only 17 and 21 minutes, with a couple of pitches thrown in between. Pittsburgh protested because the rules require a wait of at least 75 minutes before calling a game after a first delay and 45 minutes for any subsequent delay. St. Louis won the continuation 4-2.