THIS DAY IN SPORTS HISTORY: 7/28

1933 – The NFL divides into two divisions with five teams each.

1984 – The Olympic Games open in Los Angeles. The Soviet Union and 13 other Communist allies boycott the games.

1989 – Dale Murphy of the Braves becomes the 14th player in MLB history to hit two home runs in the same inning.

1990 – Shawon Dunston of the Cubs ties an MLB record by hitting three triples in one game.

1991 – Expos pitcher Dennis Martinez throws the 13th perfect game in MLB history.

1994 – MLB players vote to strike, beginning on August 12.

1994 – Texas Rangers pitcher Kenny Rogers throws a perfect game, shutting down the Angels.

1996 – Darryl Strawberry hits career home run #300.

2009 – White Sox pitcher Mark Buehrle sets an MLB record by retiring 45 straight batters. In his previous start, Buehrle threw a perfect game against the Rays and on his July 28 start, he retired the first 17 Twins hitters he faced.