John Harold Haydel
- Bats Right, Throws Right
- Height 6' 0", Weight 190 lb.
- High School St. Francis de Sales High School (Houma)
- Debut September 7, 1970
- Final Game September 28, 1971
- Born July 9, 1944 in Houma, LA USA
Haydel was signed by the Milwaukee Braves in 1962 and spent 1962 to 1970 moving up in the minor league organizations of several teams. After going 7-5 for Dublin in 1962, he was traded to the Houston Colt .45's organization and then moved over to the Chicago Cubs organization from 1963 to 1966, most notably going 12-9 for St. Cloud in 1963. From 1967 to 1969 he pitched for Phoenix in the San Francisco Giants organization, going 10-3 in 1967 and 12-8 in 1969.
When he posted a 3.35 ERA for the Evansville Triplets in the Twins organization in 1970, the Twins brought him up in September. He pitched nine innings for the Twins, giving up three runs. The Twins won their division that year.
Haydel spent part of 1971 with the Portland Beavers, going 9-3, and part of 1971 with the Twins, appearing in 31 games with a record of 4-2 and one save. He was with Tacoma in 1972.