Who was the only major leaguer to hit for the cycle, hit three home runs in one game, and turn an unassisted triple play during his career?

Boston Red Sox third baseman John Valentin is the only player to have accomplished this feat.

On July 8, 1994, in the sixth inning of a 7-4 loss to the Seattle Mariners, Valentin (who was playing shortstop) caught a line drive off the bat of Marc Newfield, stepped on second base to double off Mike Blowers, and tagged Keith Mitchell, who had been on first base and was running with the pitch.

On June 2, 1995, Valentin became the eighth Red Sox player to hit three home runs in one game when he went 5-5, with three home runs and four runs scored, in a 6-5 victory over the Mariners. He also became the first shortstop in baseball history to have 15 total bases in one game.

And on June 6, 1996, Valentin hit for the cycle in a 7-4 victory over the Chicago White Sox. The game also featured a triple play turned by the White Sox, making it the first game since 1931 to feature both a triple play and a batter hitting for the cycle.