The number of 150-innings-in-relief seasons in MLB history (11, all between 1945 & 1986) is fewer than the number of 600-inning seasons (15, all between 1874 & 1890).
Kansas City A's reliever John Wyatt - later a contributor to the 1967 Red Sox & 1968 Tigers - allowed 23 home runs in 128 relief innings in 1964. He's the only pitcher ever to allow 20 HR in relief in one season.
In 1956, 23-year-old Senators rookie pitcher Connie Grob managed to allow 44 extra base hits, 25 walks *and* 9 men reached base on errors in 72.1 relief innings (oddly, he pitched well in 7 innings in his lone start).
Grob pitched 9 more years in AAA but never again in MLB.
Grob pitched 9 more years in AAA but never again in MLB.
