Metzger made his major league debut on September 8, 1974 with the Giants. He played limitedly, pitching 12.7 innings and posting a 3.55 ERA.
He was dealt along with Tito Fuentes from the Giants to the Padres for Derrel Thomas at the Winter Meetings on December 6, 1974.[1] Metzger pitched limitedly again, having control issues (he had walked 16 men in his 17.3 innings of career pitching).
With a 0–0 record, a 5.87 ERA and having given up 27 hits in 22+2⁄3 innings in 17 appearances to start the 1977 season,[2] Metzger was traded from the Padres to the Cardinals for John D'Acquisto and Pat Scanlon on May 17, 1977.[3] Metzger posted better numbers with the Cardinals, collecting 7 saves while posting a 3.11 ERA and a record of 4 wins and 2 losses.
However, Metzger was placed on waivers by the Cardinals and picked up by the New York Mets on April 5, 1978. Metzger had a disappointing season, giving concern to the Mets about his control issues. His contract was subsequently purchased by the Philadelphia Phillies on July 4, 1978 and he was sent back to the minors. Metzger never made it back to the major league level and was released by the Phillies on March 19, 1979.
He works today as a scout.
In his five seasons of baseball, Metzger had an 18-9 record with a 3.74 ERA and 23 saves. He pitched 293.1 innings, gave up 289 hits, walked 140, and struck out 175.