Schueler was called up at the start of the 1972 season at twenty-three years old. On April 16, 1972, two days before his twenty-fourth birthday, Schueler made his major league debut as a reliever in a game against the
San Diego Padres at
San Diego Stadium. He pitched two innings and only gave up one hit in that game, but despite his efforts, the Braves lost. Schueler went on to start thirty-eight games over two years with the Braves. Schueler was dealt from the
Braves to the
Phillies for
Craig Robinson and
Barry Lersch at the
Winter Meetings on December 3, 1973. After a mediocre season as a
starter, the Phillies converted Schueler to a
relief pitcher. He pitched two more seasons in Philadelphia as a reliever and spot starter, and developed a reputation as being dour during interviews. Just days before the 1977 season began, the
Minnesota Twins purchased Schueler from the Phillies. With the Twins, he pitched as a reliever and spot starter, as he did in Philadelphia. Schueler's stay with the Twins lasted only one season, as he became a free agent after the 1977 season. A month after becoming a free agent, Schueler was signed by the
Chicago White Sox to be a reliever and spot starter. He played the 1978 season and the first half of 1979 with the White Sox. Over the course of his
MLB career, he posted a
won–lost mark of 40–48 and an
earned run average of 4.08. In 291 career
games pitched, including 86 as a
starting pitcher, he threw 13 complete games and two
shutouts, with 11
saves out of the
bullpen. He allowed 861
hits and 393
bases on balls, with 563
strikeouts, in 912
innings pitched. ==Pitching coach==