Umbarger appeared in 15 games over the 1977 season, split between the Oakland A’s and Texas, posting a 2-6 record with a 6.32 earned run average over 57 innings of work.
His first two years in the Majors were much better, as he went 8-7 and 10-12 in 1975 and 1976 respectively with Texas, posting ERA’s of 4.12 and 3.15 with five shutouts splitting time between starting and the bullpen.
He wouldn’t fare much better in 1978, posting a 5-8 record with a 4.88 ERA, thus completing what would be his 4-year career, giving him a 25-33 record with a 4.14 ERA over 133 games, 61 of which were starts, and 483 innings pitched.