MacWhorter posted an 0–3 record with a 5.53 ERA in 14 appearances, including two starts, five games finisheds, 21 strikeouts, 18 walks, 46 hits allowed, in 42⅓ innings of work. He also pitched in the minor league systems of the Dodgers (1976), Red Sox (1978–83) and Indians (1984). In an eight-season career, he went 48–56 with 570 strikeouts and a 3.86 ERA in 8611⁄3 innings.