John Francis Paciorek
- Bats Right, Throws Right
- Height 6' 2", Weight 200 lb.
- High School St. Ladislaus High School (Hamtramck)
- Debut September 29, 1963
- Final Game September 29, 1963
- Born February 11, 1945 in Detroit, MI USA
John Paciorek holds the major league record with a career 1.000 batting average and three hits. He debuted in 1963 with the Houston Colt .45s in a late-season game. He went 3 for 3, walked twice, and scored four runs. He suffered a back injury in the minors in 1963. The injury got worse over the winter of 1963-1964. By the time he recovered in 1965, it was too late. John Paciorek retired in 1969 with one career game, but what a game it was.
John Paciorek is the brother of major leaguers Tom Paciorek and Jim Paciorek and minor leaguer Mike Paciorek, the uncle of Tom Paciorek Jr. and Joseph Paciorek, and the father of Pete Paciorek and Mack Paciorek.
Through 2010, 88 players had a career batting average of 1.000: 77 were 1 for 1, 9 were 2 for 2, and Paciorek was 3 for 3.
- Richard Tellis: Once Around The Bases, Triumph Books, Chicago, 1998, pp. 239-249.