William James Spiers III (born June 5, 1966) is a former professional baseball player, and an American college football coach.

Spiers played Major League Baseball as a shortstop and third baseman from 1989 to 2001 for the Milwaukee Brewers, New York Mets, and Houston Astros.

For his baseball career, he is known for his walk off single against Trevor Hoffman and the San Diego Padres in game 2 of the 1998 1998 National League Division Series, which was the first playoff win for the team in eleven years.

On September 24, 1999, while playing with the Astros against the Brewers at Milwaukee County Stadium, Spiers was attacked by a 23-year-old man while standing in the outfield before the bottom of the 6th inning.

[1] Spiers wound up with a welt under his left eye, a bloody nose and whiplash.

[3] From 2016 to April 2024, Spiers served as a director of special teams for the football program at his alma mater at Clemson University.