Gwynn did not play baseball his first year at San Diego State in order to concentrate on basketball. He joined the Aztecs baseball team in 1979 when then-freshman shortstop Bobby Meacham, who knew Gwynn from his high school days, convinced SDSU baseball coach Jim Dietz to give Gwynn a chance to compete. Dietz was looking for replacements for two outfielders who were injured riding bicycles after being struck by an automobile.
Playing basketball, Gwynn set the Aztecs basketball record for assists in a game, season, and career.
Gwynn won eight National League batting titles in his career
He had a .338 career batting average and never hit below .309 in any full season.
In 1987, Gwynn hit .370 while stealing 56 bases. It remains the only time in the past 92 years anybody hit .370 with at least 50 steals. That same year Gwynn never went more than eight at-bats without recording a hit.
In 1993 he had the only six-hit game of his career on August 4 against the Giants.
In 1994 Gwynn batted .394, his career high and the highest in the National League since Bill Terry hit .401 in 1930. The season ended prematurely due to the baseball strike. For the second straight year, he did not go longer than two games without a hit.
Gwynn played 20 years and never struck out more than 40 times. He had more doubles than strikeouts in his career.