Jack Aker vs. Herb Pennock — Career Comparison

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Herb Pennock
Lost GenerationPennsylvaniaThrows LeftBats SwitchNorth AmericaNew York YankeesAmerican LeagueHall of FameStarting Pitcher

Herb Pennock built a career as a starting pitcher and Jack Aker as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jack Aker posted stronger surface numbers — ERA 3.28 and WHIP 1.369 compared to 3.6 and 1.348 for Herb Pennock. By the career numbers, Jack Aker had the better of this cross-role comparison — though era context would sharpen the verdict.

Pitching Stats for Jack Aker and Herb Pennock

Jack Aker
Career
Per 9 Innings
11
11
Herb Pennock
Careerverified
Per 9 Inningsverified
22
22
Jack Aker
Career
Per 9 Inningsverified
495
5.97
Herb Pennock
Careerverified
Per 9 Innings
617
1.55
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Careerverified
Per 9 Inningsverified
420
1.06
Jack Aker
Career
Per 9 Innings
47
0.57
Herb Pennock
Careerverified
Per 9 Inningsverified
240
0.6
Jack Aker
Careerverified
Per 9 Innings
45
0.54
Herb Pennock
Career
Per 9 Inningsverified
162
0.41
Jack Aker
Career
Per 9 Innings
51.09
51.09
Herb Pennock
Careerverified
Per 9 Inningsverified
59.7
59.7
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Careerverified
Per 9 Inningsverified
68.07
68.07
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Careerverified
Per 9 Inningsverified
247
0.62
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Careerverified
Per 9 Inningsverified
35
0.09
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Herb Pennock
Career
Per 9 Innings
32
0.08
Jack Aker
Careerverified
Per 9 Inningsverified
272
3.28
Herb Pennock
Career
Per 9 Innings
1428
3.6
Jack Aker
Careerverified
Per 9 Inningsverified
3.28
3.28
Herb Pennock
Career
Per 9 Innings
3.6
3.6
Jack Aker
Careerverified
Per 9 Inningsverified
3.45
3.45
Herb Pennock
Career
Per 9 Innings
3.64
3.64
Jack Aker
Career
Per 9 Innings
4.29
4.29
Herb Pennock
Careerverified
Per 9 Inningsverified
3.58
3.58
Jack Aker
Careerverified
Per 9 Inningsverified
0.244
0.244
Herb Pennock
Career
Per 9 Innings
0.275
0.275
Jack Aker
Career
Per 9 Innings
2238
27
Herb Pennock
Careerverified
Per 9 Innings
10715
27
Jack Aker
Career
Per 9 Innings
746
9
Herb Pennock
Careerverified
Per 9 Innings
3571.2
9
Jack Aker
Careerverified
Per 9 Inningsverified
679
8.19
Herb Pennock
Career
Per 9 Innings
3900
9.83
Jack Aker
Careerverified
Per 9 Inningsverified
8.19
8.19
Herb Pennock
Career
Per 9 Innings
9.83
9.83
Jack Aker
Careerverified
Per 9 Innings
64
0.77
Herb Pennock
Career
Per 9 Inningsverified
128
0.32
Jack Aker
Career
Per 9 Innings
0.77
0.77
Herb Pennock
Careerverified
Per 9 Inningsverified
0.32
0.32
Jack Aker
Careerverified
Per 9 Inningsverified
0.13
0.13
Herb Pennock
Career
Per 9 Innings
0.21
0.21
Jack Aker
Careerverified
Per 9 Innings
274
3.31
Herb Pennock
Career
Per 9 Inningsverified
916
2.31
Jack Aker
Career
Per 9 Innings
68
0.82
Herb Pennock
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
3.31
3.31
Herb Pennock
Careerverified
Per 9 Inningsverified
2.31
2.31
Jack Aker
Career
Per 9 Inningsverified
404
4.87
Herb Pennock
Careerverified
Per 9 Innings
1227
3.09
Jack Aker
Careerverified
Per 9 Inningsverified
4.87
4.87
Herb Pennock
Career
Per 9 Innings
3.09
3.09
Jack Aker
Career
Per 9 Innings
0.82
0.82
Herb Pennock
Careerverified
Per 9 Inningsverified
1.99
1.99
Jack Aker
Careerverified
Per 9 Inningsverified
0.909
0.909
Herb Pennock
Career
Per 9 Innings
0.6
0.6
Jack Aker
Careerverified
Per 9 Innings
13
0.16
Herb Pennock
Career
Per 9 Innings
65
0.16
Jack Aker
Career
Per 9 Innings
40
0.48
Herb Pennock
Careerverified
Per 9 Inningsverified
36
0.09
Jack Aker
Careerverified
Per 9 Inningsverified
0
0
Herb Pennock
Career
Per 9 Innings
6
0.02
Jack Aker
Career
Per 9 Innings
3144
37.93
Herb Pennock
Careerverified
Per 9 Inningsverified
15154
38.19
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Herb Pennock
Career
Per 9 Innings
133
0.34
Jack Aker
Careerverified
Per 9 Inningsverified
312
3.76
Herb Pennock
Career
Per 9 Innings
1692
4.26
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Herb Pennock
Career
Per 9 Innings
4.26
4.26
Jack Aker
Career
Per 9 Innings
32
0.39
Herb Pennock
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
12
0.14
Herb Pennock
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
19
0.23
Herb Pennock
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
1.278
1.278
Herb Pennock
Career
Per 9 Innings
1.348
1.348
Jack Aker
Career
Per 9 Innings
2786
33.61
Herb Pennock
Careerverified
Per 9 Inningsverified
14202
35.79
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Herb Pennock
Career
Per 9 Innings
2.74
2.74
Jack Aker
Careerverified
Per 9 Inningsverified
0.265
0.265
Herb Pennock
Career
Per 9 Innings
0.294
0.294
Jack Aker
Career
Per 9 Innings
37.93
37.93
Herb Pennock
Careerverified
Per 9 Inningsverified
38.19
38.19

Fielding Stats for Jack Aker and Herb Pennock

Jack Aker
Career
Per 9 Inningsverified
11
11
Herb Pennock
Careerverified
Per 9 Innings
22
Jack Aker
Career
Per 9 Inningsverified
495
5.97
Herb Pennock
Careerverified
Per 9 Innings
617
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Careerverified
Per 9 Inningsverified
2240
27
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Careerverified
Per 9 Inningsverified
746.2
9
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Career
Per 9 Inningsverified
65
0.78
Herb Pennock
Careerverified
Per 9 Innings
101
Jack Aker
Career
Per 9 Inningsverified
167
2.01
Herb Pennock
Careerverified
Per 9 Innings
824
Jack Aker
Careerverified
Per 9 Innings
8
0.1
Herb Pennock
Career
Per 9 Inningsverified
26
Jack Aker
Career
Per 9 Inningsverified
240
2.89
Herb Pennock
Careerverified
Per 9 Innings
951
Jack Aker
Career
Per 9 Inningsverified
232
2.8
Herb Pennock
Careerverified
Per 9 Innings
925
Jack Aker
Career
Per 9 Inningsverified
96.67
96.67
Herb Pennock
Careerverified
Per 9 Innings
97.27
Jack Aker
Career
Per 9 Inningsverified
0.469
0.469
Herb Pennock
Careerverified
Per 9 Innings
1.499
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Career
Per 9 Inningsverified
20
0.24
Herb Pennock
Careerverified
Per 9 Innings
45
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0
Jack Aker
Career
Per 9 Innings
0
0
Herb Pennock
Career
Per 9 Innings
0

Hitting Stats for Jack Aker and Herb Pennock

Jack Aker
Career
Per 600 PA
11
11
Herb Pennock
Careerverified
Per 600 PAverified
22
22
Jack Aker
Career
Per 600 PAverified
496
2861.54
Herb Pennock
Careerverified
Per 600 PA
620
260.87
Jack Aker
Career
Per 600 PA
104
600
Herb Pennock
Careerverified
Per 600 PA
1426
600
Jack Aker
Career
Per 600 PAverified
92
530.77
Herb Pennock
Careerverified
Per 600 PA
1214
510.8
Jack Aker
Career
Per 600 PA
0.076
0.076
Herb Pennock
Careerverified
Per 600 PAverified
0.191
0.191
Jack Aker
Career
Per 600 PA
0.279
0.279
Herb Pennock
Careerverified
Per 600 PAverified
0.547
0.547
Jack Aker
Career
Per 600 PA
7
40.38
Herb Pennock
Careerverified
Per 600 PAverified
232
97.62
Jack Aker
Career
Per 600 PA
5
28.85
Herb Pennock
Careerverified
Per 600 PAverified
191
80.36
Jack Aker
Career
Per 600 PA
2
11.54
Herb Pennock
Careerverified
Per 600 PAverified
33
13.88
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
4
1.68
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
4
1.68
Jack Aker
Career
Per 600 PA
2
11.54
Herb Pennock
Careerverified
Per 600 PAverified
41
17.25
Jack Aker
Careerverified
Per 600 PAverified
0.286
0.286
Herb Pennock
Career
Per 600 PA
0.177
0.177
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
0.003
0.003
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
0.017
0.017
Jack Aker
Career
Per 600 PA
0.81
4.66
Herb Pennock
Careerverified
Per 600 PAverified
77.94
32.79
Jack Aker
Career
Per 600 PA
9
51.92
Herb Pennock
Careerverified
Per 600 PAverified
285
119.92
Jack Aker
Career
Per 600 PA
9
51.92
Herb Pennock
Careerverified
Per 600 PAverified
333
140.11
Jack Aker
Career
Per 600 PA
0.096
0.096
Herb Pennock
Careerverified
Per 600 PAverified
0.253
0.253
Jack Aker
Career
Per 600 PA
0.098
0.098
Herb Pennock
Careerverified
Per 600 PAverified
0.235
0.235
Jack Aker
Career
Per 600 PA
0.194
0.194
Herb Pennock
Careerverified
Per 600 PAverified
0.488
0.488
Jack Aker
Career
Per 600 PA
0.022
0.022
Herb Pennock
Careerverified
Per 600 PAverified
0.044
0.044
Jack Aker
Career
Per 600 PA
0.068
0.068
Herb Pennock
Careerverified
Per 600 PAverified
0.173
0.173
Jack Aker
Career
Per 600 PA
0.128
0.128
Herb Pennock
Careerverified
Per 600 PAverified
0.394
0.394
Jack Aker
Career
Per 600 PA
0.171
0.171
Herb Pennock
Careerverified
Per 600 PAverified
0.221
0.221
Jack Aker
Career
Per 600 PA
3
17.31
Herb Pennock
Careerverified
Per 600 PAverified
108
45.44
Jack Aker
Career
Per 600 PA
4
23.08
Herb Pennock
Careerverified
Per 600 PAverified
103
43.34
Jack Aker
Career
Per 600 PA
7
40.38
Herb Pennock
Careerverified
Per 600 PAverified
207
87.1
Jack Aker
Career
Per 600 PA
-4.13
-23.83
Herb Pennock
Careerverified
Per 600 PAverified
85.09
35.8
Jack Aker
Career
Per 600 PAverified
1
5.77
Herb Pennock
Careerverified
Per 600 PA
7
2.95
Jack Aker
Career
Per 600 PA
1
5.77
Herb Pennock
Careerverified
Per 600 PAverified
94
39.55
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PA
51
294.23
Herb Pennock
Career
Per 600 PAverified
178
74.89
Jack Aker
Career
Per 600 PA
2.04
2.04
Herb Pennock
Careerverified
Per 600 PAverified
8.01
8.01
Jack Aker
Career
Per 600 PA
0.02
0.02
Herb Pennock
Careerverified
Per 600 PAverified
0.53
0.53
Jack Aker
Career
Per 600 PAverified
10
57.69
Herb Pennock
Careerverified
Per 600 PA
111
46.7
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
1
5.77
Herb Pennock
Careerverified
Per 600 PAverified
0
0
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
1
0.42
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Herb Pennock
Careerverified
Per 600 PAverified
1
0.42
Jack Aker
Career
Per 600 PA
Herb Pennock
Careerverified
Per 600 PAverified
100
100