Career Earned Run Average (Min. 75 Innings Pitched, 2 seasons)
Rank	Name	Seasons	ERA
1	John Miller	1967-69	2.28
2	Wayne Faas	1966-69	2.367
3	Mike Zeigler	1965-68	2.368
4	Larry Sawyer	1967-70	2.38
5	Ray Savorn	1961-62	2.44
6	Dave Kerestly	1970-72	2.57
7	Gary Clay	1969-72	2.60
8	Todd Alexander	1961-64	2.94
9	Mike Fogle	1989-92	3.36
10	Russ Laubach	1980-83	3.45

 

Single-Season Earned Run Average (Min. 30 Innings Pitched)
Rank	Name	Season	ERA
1	Tom Good	1970	1.16
2	Larry Sawyer	1969	1.19
3	John Miller	1968	1.41
4	Gary Clay	1971	1.55
5	Dave Kerestly	1972	1.59
6	Wayne Faas	1966	1.74
7	Garry Ross	1966	1.81
8	Daniel Boring	1963	1.85
9	Todd Alexander	1964	1.90
10	Mike Zeigler	1967	1.93