 Chuck made his major league debut with the Orioles two seasons later, on April 21, 1960, in front of a crowd of 9,377 at Memorial Stadium.Estrada came in relief for starting pitcher Steve Barber in the 5th inning, and pitched two innings of one-hit ball with five strikeouts.Estrada spent the beginning of the season coming in relief, but he later joined the young Orioles starting pitching rotation, which also featured Steve Barber, Milt Pappas, Jerry Walker and Jack Fisher.