Rudy Hernandez vs. Jerry Koosman — Career Comparison

Rudy Hernandez
Silent GenerationD.R.Throws RightBats RightCaribbeanWashington SenatorsAmerican LeagueRelief Pitcher
Jerry Koosman
Silent GenerationMinnesotaThrows LeftBats RightNorth AmericaNew York MetsNational LeagueStarting PitcherAll-Star

Jerry Koosman built a career as a starting pitcher and Rudy Hernandez as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jerry Koosman posted stronger surface numbers — ERA 3.36 and WHIP 1.290 compared to 4.12 and 1.580 for Rudy Hernandez. By the career numbers, Jerry Koosman had the better of this cross-role comparison — though era context would sharpen the verdict.

Pitching Stats for Rudy Hernandez and Jerry Koosman

Rudy Hernandez
Career
Per 9 Innings
2
2
Jerry Koosman
Careerverified
Per 9 Inningsverified
19
19
Rudy Hernandez
Career
Per 9 Inningsverified
28
5.77
Jerry Koosman
Careerverified
Per 9 Innings
612
1.43
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
527
1.24
Rudy Hernandez
Career
Per 9 Inningsverified
4
0.82
Jerry Koosman
Careerverified
Per 9 Innings
222
0.52
Rudy Hernandez
Careerverified
Per 9 Inningsverified
2
0.41
Jerry Koosman
Career
Per 9 Innings
209
0.49
Rudy Hernandez
Careerverified
Per 9 Inningsverified
66.67
66.67
Jerry Koosman
Career
Per 9 Innings
51.51
51.51
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
86.11
86.11
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
140
0.33
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
33
0.08
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
17
0.04
Rudy Hernandez
Careerverified
Per 9 Innings
20
4.12
Jerry Koosman
Career
Per 9 Inningsverified
1433
3.36
Rudy Hernandez
Career
Per 9 Innings
4.12
4.12
Jerry Koosman
Careerverified
Per 9 Inningsverified
3.36
3.36
Rudy Hernandez
Career
Per 9 Innings
3.98
3.98
Jerry Koosman
Careerverified
Per 9 Inningsverified
3.33
3.33
Rudy Hernandez
Career
Per 9 Innings
4.12
4.12
Jerry Koosman
Careerverified
Per 9 Inningsverified
3.64
3.64
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0.247
0.247
Jerry Koosman
Career
Per 9 Innings
0.252
0.252
Rudy Hernandez
Career
Per 9 Innings
131
27
Jerry Koosman
Careerverified
Per 9 Innings
11518
27
Rudy Hernandez
Career
Per 9 Innings
43.2
9
Jerry Koosman
Careerverified
Per 9 Innings
3839.1
9
Rudy Hernandez
Careerverified
Per 9 Innings
42
8.66
Jerry Koosman
Career
Per 9 Inningsverified
3635
8.52
Rudy Hernandez
Career
Per 9 Innings
8.66
8.66
Jerry Koosman
Careerverified
Per 9 Inningsverified
8.52
8.52
Rudy Hernandez
Careerverified
Per 9 Inningsverified
2
0.41
Jerry Koosman
Career
Per 9 Innings
290
0.68
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0.41
0.41
Jerry Koosman
Career
Per 9 Innings
0.68
0.68
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0.07
0.07
Jerry Koosman
Career
Per 9 Innings
0.47
0.47
Rudy Hernandez
Careerverified
Per 9 Innings
24
4.95
Jerry Koosman
Career
Per 9 Inningsverified
1198
2.81
Rudy Hernandez
Careerverified
Per 9 Innings
3
0.62
Jerry Koosman
Career
Per 9 Inningsverified
121
0.28
Rudy Hernandez
Career
Per 9 Innings
4.95
4.95
Jerry Koosman
Careerverified
Per 9 Inningsverified
2.81
2.81
Rudy Hernandez
Career
Per 9 Innings
26
5.36
Jerry Koosman
Careerverified
Per 9 Inningsverified
2556
5.99
Rudy Hernandez
Career
Per 9 Innings
5.36
5.36
Jerry Koosman
Careerverified
Per 9 Inningsverified
5.99
5.99
Rudy Hernandez
Career
Per 9 Innings
0.93
0.93
Jerry Koosman
Careerverified
Per 9 Inningsverified
4.18
4.18
Rudy Hernandez
Careerverified
Per 9 Inningsverified
1.145
1.145
Jerry Koosman
Career
Per 9 Innings
0.978
0.978
Rudy Hernandez
Careerverified
Per 9 Innings
4
0.82
Jerry Koosman
Career
Per 9 Inningsverified
89
0.21
Rudy Hernandez
Careerverified
Per 9 Innings
1
0.21
Jerry Koosman
Career
Per 9 Inningsverified
71
0.17
Rudy Hernandez
Careerverified
Per 9 Innings
1
0.21
Jerry Koosman
Career
Per 9 Inningsverified
29
0.07
Rudy Hernandez
Career
Per 9 Inningsverified
195
40.19
Jerry Koosman
Careerverified
Per 9 Innings
15996
37.5
Rudy Hernandez
Career
Per 9 Inningsverified
13
2.68
Jerry Koosman
Careerverified
Per 9 Innings
43
0.1
Rudy Hernandez
Careerverified
Per 9 Innings
29
5.98
Jerry Koosman
Career
Per 9 Inningsverified
1608
3.77
Rudy Hernandez
Career
Per 9 Innings
5.98
5.98
Jerry Koosman
Careerverified
Per 9 Inningsverified
3.77
3.77
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0
0
Jerry Koosman
Career
Per 9 Innings
173
0.41
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0
0
Jerry Koosman
Career
Per 9 Innings
98
0.23
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
230
0.54
Rudy Hernandez
Career
Per 9 Innings
1.512
1.512
Jerry Koosman
Careerverified
Per 9 Inningsverified
1.259
1.259
Rudy Hernandez
Career
Per 9 Inningsverified
170
35.04
Jerry Koosman
Careerverified
Per 9 Innings
14456
33.89
Rudy Hernandez
Careerverified
Per 9 Inningsverified
1.04
1.04
Jerry Koosman
Career
Per 9 Innings
2.63
2.63
Rudy Hernandez
Careerverified
Per 9 Inningsverified
0.282
0.282
Jerry Koosman
Career
Per 9 Innings
0.288
0.288
Rudy Hernandez
Careerverified
Per 9 Inningsverified
40.19
40.19
Jerry Koosman
Career
Per 9 Innings
37.5
37.5

Fielding Stats for Rudy Hernandez and Jerry Koosman

Rudy Hernandez
Career
Per 9 Innings
2
2
Jerry Koosman
Careerverified
Per 9 Inningsverified
19
19
Rudy Hernandez
Career
Per 9 Inningsverified
28
5.77
Jerry Koosman
Careerverified
Per 9 Innings
612
1.43
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
527
1.24
Rudy Hernandez
Career
Per 9 Innings
131
27
Jerry Koosman
Careerverified
Per 9 Innings
11519
27
Rudy Hernandez
Career
Per 9 Innings
43.2
9
Jerry Koosman
Careerverified
Per 9 Innings
3839.2
9
Rudy Hernandez
Career
Per 9 Inningsverified
2
0.41
Jerry Koosman
Careerverified
Per 9 Innings
116
0.27
Rudy Hernandez
Career
Per 9 Inningsverified
7
1.44
Jerry Koosman
Careerverified
Per 9 Innings
582
1.36
Rudy Hernandez
Careerverified
Per 9 Innings
1
0.21
Jerry Koosman
Career
Per 9 Inningsverified
42
0.1
Rudy Hernandez
Career
Per 9 Inningsverified
10
2.06
Jerry Koosman
Careerverified
Per 9 Innings
740
1.73
Rudy Hernandez
Career
Per 9 Inningsverified
9
1.85
Jerry Koosman
Careerverified
Per 9 Innings
698
1.64
Rudy Hernandez
Career
Per 9 Innings
90
90
Jerry Koosman
Careerverified
Per 9 Inningsverified
94.32
94.32
Rudy Hernandez
Career
Per 9 Innings
0.321
0.321
Jerry Koosman
Careerverified
Per 9 Inningsverified
1.141
1.141
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Careerverified
Per 9 Inningsverified
86.11
86.11
Rudy Hernandez
Career
Per 9 Inningsverified
1
0.21
Jerry Koosman
Careerverified
Per 9 Innings
36
0.08
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Career
Per 9 Innings
0
0
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Career
Per 9 Innings
0
0
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Career
Per 9 Innings
0
0
Rudy Hernandez
Career
Per 9 Innings
0
0
Jerry Koosman
Career
Per 9 Innings
0
0

Hitting Stats for Rudy Hernandez and Jerry Koosman

Rudy Hernandez
Career
Per 600 PA
2
2
Jerry Koosman
Careerverified
Per 600 PAverified
19
19
Rudy Hernandez
Career
Per 600 PAverified
31
2657.14
Jerry Koosman
Careerverified
Per 600 PA
612
349.05
Rudy Hernandez
Career
Per 600 PA
7
600
Jerry Koosman
Careerverified
Per 600 PA
1052
600
Rudy Hernandez
Career
Per 600 PA
6
514.29
Jerry Koosman
Careerverified
Per 600 PAverified
915
521.86
Rudy Hernandez
Careerverified
Per 600 PAverified
0.167
0.167
Jerry Koosman
Career
Per 600 PA
0.119
0.119
Rudy Hernandez
Careerverified
Per 600 PAverified
0.429
0.429
Jerry Koosman
Career
Per 600 PA
0.374
0.374
Rudy Hernandez
Career
Per 600 PAverified
1
85.71
Jerry Koosman
Careerverified
Per 600 PA
109
62.17
Rudy Hernandez
Career
Per 600 PAverified
1
85.71
Jerry Koosman
Careerverified
Per 600 PA
94
53.61
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
12
6.84
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
1
0.57
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
2
1.14
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
15
8.56
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
0.138
0.138
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
0.002
0.002
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
0.018
0.018
Rudy Hernandez
Career
Per 600 PAverified
0.15
12.83
Jerry Koosman
Careerverified
Per 600 PA
18.19
10.37
Rudy Hernandez
Career
Per 600 PAverified
1
85.71
Jerry Koosman
Careerverified
Per 600 PA
129
73.57
Rudy Hernandez
Career
Per 600 PAverified
1
85.71
Jerry Koosman
Careerverified
Per 600 PA
144
82.13
Rudy Hernandez
Careerverified
Per 600 PAverified
0.167
0.167
Jerry Koosman
Career
Per 600 PA
0.151
0.151
Rudy Hernandez
Careerverified
Per 600 PAverified
0.167
0.167
Jerry Koosman
Career
Per 600 PA
0.141
0.141
Rudy Hernandez
Careerverified
Per 600 PAverified
0.333
0.333
Jerry Koosman
Career
Per 600 PA
0.292
0.292
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
0.022
0.022
Rudy Hernandez
Careerverified
Per 600 PAverified
0.117
0.117
Jerry Koosman
Career
Per 600 PA
0.103
0.103
Rudy Hernandez
Career
Per 600 PA
0.2
0.2
Jerry Koosman
Career
Per 600 PA
0.2
0.2
Rudy Hernandez
Career
Per 600 PA
0.2
0.2
Jerry Koosman
Careerverified
Per 600 PAverified
0.215
0.215
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
36
20.53
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
46
26.24
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
80
45.63
Rudy Hernandez
Careerverified
Per 600 PAverified
0.11
9.79
Jerry Koosman
Career
Per 600 PA
-9.7
-5.53
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
2
1.14
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
33
18.82
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Career
Per 600 PA
0
0
Rudy Hernandez
Careerverified
Per 600 PAverified
1
85.71
Jerry Koosman
Career
Per 600 PA
418
238.4
Rudy Hernandez
Careerverified
Per 600 PAverified
7
7
Jerry Koosman
Career
Per 600 PA
2.52
2.52
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
0.08
0.08
Rudy Hernandez
Career
Per 600 PAverified
1
85.71
Jerry Koosman
Careerverified
Per 600 PA
100
57.03
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
2
1.14
Rudy Hernandez
Careerverified
Per 600 PAverified
0
0
Jerry Koosman
Career
Per 600 PA
19
10.84
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
1
0.57
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Career
Per 600 PA
0
0
Rudy Hernandez
Career
Per 600 PA
0
0
Jerry Koosman
Careerverified
Per 600 PAverified
1
0.57
Rudy Hernandez
Career
Per 600 PA
Jerry Koosman
Careerverified
Per 600 PAverified
100
100