John Davis was drafted in the seventh round of the 1981 draft and made his major league debut on July 24, 1987. He was used primarily as a middle reliever in his short career. He had a pretty good rookie season with Kansas City going 5-2 with a 2.27 ERA in 43 2/3 innings pitched. Walks were a problem for him though (26 in 1987 and 50 in 63.2 innings a year later).
He played his final Major League game on August 15, 1990, but attempted a comeback with the Nashville Sounds in 1995.