C.J. Wilson
Wilson was one of the most frustrating players to watch near the end of his Rangers career, as he became the only player in MLB history at that time to lose the All-Star Game, an ALDS game, an ALCS game, and a World Series game (all in 2011). Then to make matters worse, he spurned the Rangers in that off-season to join their division rivals in Anaheim. After his second season with the Angels, he was hit with the injury bug, and his career started to spiral downhill from there, retiring two years later. Much to the satisfaction of annoyed Rangers fans, he had a 6.33 ERA across ten starts against his old ball club.