After languishing over eight seasons in the minors, Farr capitalized on a trial with the Royals in 1985. Relying on a baffling slider and fine curveball, he eventually replaced Dan Quisenberry as the Royals’ closer. In 1988 Farr saved 20 games and led Kansas City pitchers with a 2.50 ERA.
Farr notched 18 saves for the Royals in 1989, but the emergence of Jeff Montgomery signaled the end of his tenure as the club’s top fireman. In November 1990 Farr signed with the Yankees, with whom he averaged 26 saves over the next three seasons.
1994 marked the end of the road for the aging veteran, who began the year with the Indians but was sent to the Red Sox with prospect Chris Nabholz in June in a deal for Jeff Russell. When the strike hit, Farr called it quits.