Jack Aker vs. Joe Niekro — Career Comparison

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Joe Niekro
Silent GenerationOhioThrows RightBats RightNorth AmericaHouston AstrosAmerican LeagueStarting PitcherAll-Star

Joe Niekro 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 led in strikeout rate (K%+ 86 vs 69), walk avoidance (BB%+ 100 vs 90), and run prevention (ERA+ 89 vs 83). Joe Niekro held the edge in home run suppression (HR9+ 79 vs 76). Role difference aside, Jack Aker holds a clear edge on every meaningful shared measure.

Pitching Stats for Jack Aker and Joe Niekro

Jack Aker
Career
Per 9 Innings
11
11
Joe Niekro
Careerverified
Per 9 Inningsverified
22
22
Jack Aker
Career
Per 9 Inningsverified
495
5.97
Joe Niekro
Careerverified
Per 9 Innings
702
1.76
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
500
1.26
Jack Aker
Career
Per 9 Inningsverified
47
0.57
Joe Niekro
Careerverified
Per 9 Innings
221
0.55
Jack Aker
Careerverified
Per 9 Innings
45
0.54
Joe Niekro
Career
Per 9 Inningsverified
204
0.51
Jack Aker
Career
Per 9 Innings
51.09
51.09
Joe Niekro
Careerverified
Per 9 Inningsverified
52
52
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
71.23
71.23
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
107
0.27
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
29
0.07
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Joe Niekro
Career
Per 9 Innings
16
0.04
Jack Aker
Careerverified
Per 9 Inningsverified
272
3.28
Joe Niekro
Career
Per 9 Innings
1431
3.59
Jack Aker
Careerverified
Per 9 Inningsverified
3.28
3.28
Joe Niekro
Career
Per 9 Innings
3.59
3.59
Jack Aker
Careerverified
Per 9 Inningsverified
3.45
3.45
Joe Niekro
Career
Per 9 Innings
3.61
3.61
Jack Aker
Career
Per 9 Innings
4.29
4.29
Joe Niekro
Careerverified
Per 9 Inningsverified
4.14
4.14
Jack Aker
Careerverified
Per 9 Inningsverified
0.244
0.244
Joe Niekro
Career
Per 9 Innings
0.254
0.254
Jack Aker
Career
Per 9 Innings
2238
27
Joe Niekro
Careerverified
Per 9 Innings
10752
27
Jack Aker
Career
Per 9 Innings
746
9
Joe Niekro
Careerverified
Per 9 Innings
3584
9
Jack Aker
Careerverified
Per 9 Inningsverified
679
8.19
Joe Niekro
Career
Per 9 Innings
3466
8.7
Jack Aker
Careerverified
Per 9 Inningsverified
8.19
8.19
Joe Niekro
Career
Per 9 Innings
8.7
8.7
Jack Aker
Careerverified
Per 9 Innings
64
0.77
Joe Niekro
Career
Per 9 Inningsverified
276
0.69
Jack Aker
Career
Per 9 Innings
0.77
0.77
Joe Niekro
Careerverified
Per 9 Inningsverified
0.69
0.69
Jack Aker
Careerverified
Per 9 Inningsverified
0.13
0.13
Joe Niekro
Career
Per 9 Innings
0.39
0.39
Jack Aker
Careerverified
Per 9 Innings
274
3.31
Joe Niekro
Career
Per 9 Inningsverified
1262
3.17
Jack Aker
Careerverified
Per 9 Innings
68
0.82
Joe Niekro
Career
Per 9 Inningsverified
71
0.18
Jack Aker
Career
Per 9 Innings
3.31
3.31
Joe Niekro
Careerverified
Per 9 Inningsverified
3.17
3.17
Jack Aker
Career
Per 9 Inningsverified
404
4.87
Joe Niekro
Careerverified
Per 9 Innings
1747
4.39
Jack Aker
Careerverified
Per 9 Inningsverified
4.87
4.87
Joe Niekro
Career
Per 9 Innings
4.39
4.39
Jack Aker
Career
Per 9 Innings
0.82
0.82
Joe Niekro
Careerverified
Per 9 Inningsverified
2.49
2.49
Jack Aker
Careerverified
Per 9 Inningsverified
0.909
0.909
Joe Niekro
Career
Per 9 Innings
0.84
0.84
Jack Aker
Careerverified
Per 9 Inningsverified
13
0.16
Joe Niekro
Career
Per 9 Innings
172
0.43
Jack Aker
Careerverified
Per 9 Innings
40
0.48
Joe Niekro
Career
Per 9 Inningsverified
65
0.16
Jack Aker
Careerverified
Per 9 Inningsverified
0
0
Joe Niekro
Career
Per 9 Innings
8
0.02
Jack Aker
Career
Per 9 Innings
3144
37.93
Joe Niekro
Careerverified
Per 9 Inningsverified
15166
38.08
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Joe Niekro
Career
Per 9 Innings
93
0.23
Jack Aker
Careerverified
Per 9 Inningsverified
312
3.76
Joe Niekro
Career
Per 9 Innings
1620
4.07
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Joe Niekro
Career
Per 9 Innings
4.07
4.07
Jack Aker
Careerverified
Per 9 Innings
32
0.39
Joe Niekro
Career
Per 9 Inningsverified
106
0.27
Jack Aker
Careerverified
Per 9 Inningsverified
12
0.14
Joe Niekro
Career
Per 9 Innings
96
0.24
Jack Aker
Career
Per 9 Innings
19
0.23
Joe Niekro
Careerverified
Per 9 Inningsverified
200
0.5
Jack Aker
Careerverified
Per 9 Inningsverified
1.278
1.278
Joe Niekro
Career
Per 9 Innings
1.319
1.319
Jack Aker
Career
Per 9 Innings
2786
33.61
Joe Niekro
Careerverified
Per 9 Inningsverified
13637
34.24
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Joe Niekro
Career
Per 9 Innings
2.31
2.31
Jack Aker
Careerverified
Per 9 Inningsverified
0.265
0.265
Joe Niekro
Career
Per 9 Innings
0.275
0.275
Jack Aker
Career
Per 9 Innings
37.93
37.93
Joe Niekro
Careerverified
Per 9 Inningsverified
38.08
38.08

Fielding Stats for Jack Aker and Joe Niekro

Jack Aker
Career
Per 9 Innings
11
11
Joe Niekro
Careerverified
Per 9 Inningsverified
22
22
Jack Aker
Career
Per 9 Inningsverified
495
5.97
Joe Niekro
Careerverified
Per 9 Innings
702
1.76
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
500
1.26
Jack Aker
Career
Per 9 Innings
2240
27
Joe Niekro
Careerverified
Per 9 Innings
10752
27
Jack Aker
Career
Per 9 Innings
746.2
9
Joe Niekro
Careerverified
Per 9 Innings
3584
9
Jack Aker
Career
Per 9 Inningsverified
65
0.78
Joe Niekro
Careerverified
Per 9 Innings
253
0.64
Jack Aker
Career
Per 9 Inningsverified
167
2.01
Joe Niekro
Careerverified
Per 9 Innings
532
1.34
Jack Aker
Careerverified
Per 9 Innings
8
0.1
Joe Niekro
Career
Per 9 Inningsverified
25
0.06
Jack Aker
Career
Per 9 Inningsverified
240
2.89
Joe Niekro
Careerverified
Per 9 Innings
810
2.03
Jack Aker
Career
Per 9 Inningsverified
232
2.8
Joe Niekro
Careerverified
Per 9 Innings
785
1.97
Jack Aker
Career
Per 9 Innings
96.67
96.67
Joe Niekro
Careerverified
Per 9 Inningsverified
96.91
96.91
Jack Aker
Career
Per 9 Innings
0.469
0.469
Joe Niekro
Careerverified
Per 9 Inningsverified
1.118
1.118
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Careerverified
Per 9 Inningsverified
71.23
71.23
Jack Aker
Career
Per 9 Inningsverified
20
0.24
Joe Niekro
Careerverified
Per 9 Innings
41
0.1
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Joe Niekro
Career
Per 9 Innings
0
0

Hitting Stats for Jack Aker and Joe Niekro

Jack Aker
Career
Per 600 PA
11
11
Joe Niekro
Careerverified
Per 600 PAverified
22
22
Jack Aker
Career
Per 600 PAverified
496
2861.54
Joe Niekro
Careerverified
Per 600 PA
706
363.61
Jack Aker
Career
Per 600 PA
104
600
Joe Niekro
Careerverified
Per 600 PA
1165
600
Jack Aker
Career
Per 600 PAverified
92
530.77
Joe Niekro
Careerverified
Per 600 PA
973
501.12
Jack Aker
Career
Per 600 PA
0.076
0.076
Joe Niekro
Careerverified
Per 600 PAverified
0.156
0.156
Jack Aker
Career
Per 600 PA
0.279
0.279
Joe Niekro
Careerverified
Per 600 PAverified
0.47
0.47
Jack Aker
Career
Per 600 PA
7
40.38
Joe Niekro
Careerverified
Per 600 PAverified
152
78.28
Jack Aker
Career
Per 600 PA
5
28.85
Joe Niekro
Careerverified
Per 600 PAverified
124
63.86
Jack Aker
Career
Per 600 PA
2
11.54
Joe Niekro
Careerverified
Per 600 PAverified
26
13.39
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
1
0.52
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
1
0.52
Jack Aker
Career
Per 600 PA
2
11.54
Joe Niekro
Careerverified
Per 600 PAverified
28
14.42
Jack Aker
Careerverified
Per 600 PAverified
0.286
0.286
Joe Niekro
Career
Per 600 PA
0.184
0.184
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
0.001
0.001
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
0.007
0.007
Jack Aker
Career
Per 600 PA
0.81
4.66
Joe Niekro
Careerverified
Per 600 PAverified
32.52
16.75
Jack Aker
Career
Per 600 PA
9
51.92
Joe Niekro
Careerverified
Per 600 PAverified
183
94.25
Jack Aker
Career
Per 600 PA
9
51.92
Joe Niekro
Careerverified
Per 600 PAverified
191
98.37
Jack Aker
Career
Per 600 PA
0.096
0.096
Joe Niekro
Careerverified
Per 600 PAverified
0.188
0.188
Jack Aker
Career
Per 600 PA
0.098
0.098
Joe Niekro
Careerverified
Per 600 PAverified
0.188
0.188
Jack Aker
Career
Per 600 PA
0.194
0.194
Joe Niekro
Careerverified
Per 600 PAverified
0.376
0.376
Jack Aker
Career
Per 600 PA
0.022
0.022
Joe Niekro
Careerverified
Per 600 PAverified
0.032
0.032
Jack Aker
Career
Per 600 PA
0.068
0.068
Joe Niekro
Careerverified
Per 600 PAverified
0.131
0.131
Jack Aker
Career
Per 600 PA
0.128
0.128
Joe Niekro
Careerverified
Per 600 PAverified
0.266
0.266
Jack Aker
Career
Per 600 PA
0.171
0.171
Joe Niekro
Careerverified
Per 600 PAverified
0.211
0.211
Jack Aker
Career
Per 600 PA
3
17.31
Joe Niekro
Careerverified
Per 600 PAverified
55
28.33
Jack Aker
Career
Per 600 PA
4
23.08
Joe Niekro
Careerverified
Per 600 PAverified
72
37.08
Jack Aker
Career
Per 600 PA
7
40.38
Joe Niekro
Careerverified
Per 600 PAverified
126
64.89
Jack Aker
Career
Per 600 PA
-4.13
-23.83
Joe Niekro
Careerverified
Per 600 PAverified
21.46
11.05
Jack Aker
Career
Per 600 PAverified
1
5.77
Joe Niekro
Career
Per 600 PA
1
0.52
Jack Aker
Career
Per 600 PA
1
5.77
Joe Niekro
Careerverified
Per 600 PAverified
38
19.57
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PA
51
294.23
Joe Niekro
Career
Per 600 PAverified
262
134.94
Jack Aker
Career
Per 600 PA
2.04
2.04
Joe Niekro
Careerverified
Per 600 PAverified
4.45
4.45
Jack Aker
Career
Per 600 PA
0.02
0.02
Joe Niekro
Careerverified
Per 600 PAverified
0.15
0.15
Jack Aker
Career
Per 600 PA
10
57.69
Joe Niekro
Careerverified
Per 600 PAverified
147
75.71
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
6
3.09
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Joe Niekro
Career
Per 600 PA
17
8.76
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
1
0.52
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Joe Niekro
Careerverified
Per 600 PAverified
1
0.52
Jack Aker
Career
Per 600 PA
Joe Niekro
Careerverified
Per 600 PAverified
100
100