A teammate lead Mark to the decision to follow Jesus Christ

one hundred and fifty seven innings with an incredible 1.72 ERA, a 14-6 win record along with his ten saves. Mark also showed amazing class, as he turned down the chance to pitch five more innings to meet the bare minimum and steal the ERA title away from Roger Clemens.

Mark once again was an effective reliever for the Blue Jays in 1987. But by 1988, either the teams in the league had figured out how to hit the ball off Mark with his unconventional pitching or the work load of innings total from the previous two years had caught up to him and he started to backslide in both 1988 and 1989. In 1990, Mark started to regain his pitching touch and he began a string of successful seasons that would continue through the 1994 season; this included excellent seasons for the California Angels in 1991 and the Baltimore Orioles in 1994. Mark then returned to the Toronto Blue Jays in a trade during the 1992 and 1993 seasons and playoffs for the Blue Jays. Mark was extremely effective in the limited duties, he appeared in exactly one game each series, and he surrendered no runs in four and a third innings played.

Mark then missed the entire 1995 season, but he did return to play in 1996 with the California Angels, although he was playing way below the league average.