cuellar had a rocky start in game two of the 1970 world series against the upstart national league champion cincinnati reds, with weaver again pulling him out of the game again, this time in the third inning. in game five, cuellar was again hit hard early, giving up three runs to the reds in the first inning. it was then that his pitching coach, george bamberger, advised cuellar to stop throwing his screwball for the rest of the game. pitching with just his fastball, curveball, and changeup, cuellar shut out the reds for the next eight innings to defeat them 9–3, clinching the world series title for the orioles, winning four games to one.