The Pine Tar Incident (also known as the Pine Tar Game) was a controversial incident during an American League Baseball game played between the Kansas City Royals and New York Yankees on July 24, 1983 at Yankee Stadium in New York City. With his team trailing 4–3 in the top half of the ninth inning, with two outs, George Brett of the Royals hit a two-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.
Playing at New York's Yankee Stadium, the Royals were trailing 4–3 with two outs in the top of the ninth and U L Washington on first base. George Brett came to the plate and connected off Yankee reliever Rich "Goose" Gossage for a two-run home run and a 5–4 lead.
As Brett crossed the plate, New York manager Billy Martin approached rookie home plate umpire Tim McClelland and requested Brett's bat be examined. Earlier in the season, Martin and other members of the Yankees had noticed the amount of pine tar used by Brett, but Martin had chosen not to say anything until it was strategically useful to do so. Yankees third baseman Graig Nettles recalled a similar incident involving Thurman Munson in a 1975 game against the Minnesota Twins. According to Nettles' autobiography, Balls, Nettles claims that he actually informed Martin of the pine tar rule, as Nettles had previously undergone the same scrutiny with his own bat while with the Twins.