Jack Aker vs. Kevin Olsen — Career Comparison

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Kevin Olsen
Gen XCaliforniaThrows RightBats RightNorth AmericaFlorida MarlinsNational LeagueStarting Pitcher

Kevin Olsen 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 5.12 and 1.609 for Kevin Olsen. 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 Kevin Olsen

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Kevin Olsen
Career
Per 9 Innings
3
3
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Kevin Olsen
Career
Per 9 Innings
28
3.05
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Careerverified
Per 9 Inningsverified
10
1.09
Jack Aker
Careerverified
Per 9 Inningsverified
47
0.57
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
45
0.54
Kevin Olsen
Careerverified
Per 9 Innings
5
0.54
Jack Aker
Careerverified
Per 9 Inningsverified
51.09
51.09
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Careerverified
Per 9 Inningsverified
35.71
35.71
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Inningsverified
272
3.28
Kevin Olsen
Careerverified
Per 9 Innings
47
5.12
Jack Aker
Careerverified
Per 9 Inningsverified
3.28
3.28
Kevin Olsen
Career
Per 9 Innings
5.12
5.12
Jack Aker
Careerverified
Per 9 Inningsverified
3.45
3.45
Kevin Olsen
Career
Per 9 Innings
4.89
4.89
Jack Aker
Career
Per 9 Innings
4.29
4.29
Kevin Olsen
Careerverified
Per 9 Inningsverified
3.96
3.96
Jack Aker
Careerverified
Per 9 Inningsverified
0.244
0.244
Kevin Olsen
Career
Per 9 Innings
0.288
0.288
Jack Aker
Careerverified
Per 9 Innings
2238
27
Kevin Olsen
Career
Per 9 Innings
248
27
Jack Aker
Careerverified
Per 9 Innings
746
9
Kevin Olsen
Career
Per 9 Innings
82.2
9
Jack Aker
Career
Per 9 Inningsverified
679
8.19
Kevin Olsen
Careerverified
Per 9 Innings
93
10.13
Jack Aker
Careerverified
Per 9 Inningsverified
8.19
8.19
Kevin Olsen
Career
Per 9 Innings
10.13
10.13
Jack Aker
Career
Per 9 Innings
64
0.77
Kevin Olsen
Careerverified
Per 9 Inningsverified
7
0.76
Jack Aker
Career
Per 9 Innings
0.77
0.77
Kevin Olsen
Careerverified
Per 9 Inningsverified
0.76
0.76
Jack Aker
Careerverified
Per 9 Inningsverified
0.13
0.13
Kevin Olsen
Career
Per 9 Innings
0.25
0.25
Jack Aker
Career
Per 9 Inningsverified
274
3.31
Kevin Olsen
Careerverified
Per 9 Innings
37
4.03
Jack Aker
Career
Per 9 Innings
68
0.82
Kevin Olsen
Careerverified
Per 9 Inningsverified
3
0.33
Jack Aker
Careerverified
Per 9 Inningsverified
3.31
3.31
Kevin Olsen
Career
Per 9 Innings
4.03
4.03
Jack Aker
Careerverified
Per 9 Innings
404
4.87
Kevin Olsen
Career
Per 9 Inningsverified
63
6.86
Jack Aker
Career
Per 9 Innings
4.87
4.87
Kevin Olsen
Careerverified
Per 9 Inningsverified
6.86
6.86
Jack Aker
Career
Per 9 Innings
0.82
0.82
Kevin Olsen
Careerverified
Per 9 Inningsverified
2.25
2.25
Jack Aker
Career
Per 9 Innings
0.909
0.909
Kevin Olsen
Careerverified
Per 9 Inningsverified
1.21
1.21
Jack Aker
Career
Per 9 Inningsverified
13
0.16
Kevin Olsen
Careerverified
Per 9 Innings
4
0.44
Jack Aker
Career
Per 9 Innings
40
0.48
Kevin Olsen
Careerverified
Per 9 Inningsverified
1
0.11
Jack Aker
Careerverified
Per 9 Inningsverified
0
0
Kevin Olsen
Career
Per 9 Innings
1
0.11
Jack Aker
Careerverified
Per 9 Innings
3144
37.93
Kevin Olsen
Career
Per 9 Inningsverified
368
40.06
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Kevin Olsen
Career
Per 9 Innings
5
0.54
Jack Aker
Career
Per 9 Inningsverified
312
3.76
Kevin Olsen
Careerverified
Per 9 Innings
51
5.55
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Kevin Olsen
Career
Per 9 Innings
5.55
5.55
Jack Aker
Career
Per 9 Inningsverified
32
0.39
Kevin Olsen
Careerverified
Per 9 Innings
5
0.54
Jack Aker
Career
Per 9 Inningsverified
12
0.14
Kevin Olsen
Careerverified
Per 9 Innings
2
0.22
Jack Aker
Careerverified
Per 9 Innings
19
0.23
Kevin Olsen
Career
Per 9 Inningsverified
14
1.52
Jack Aker
Careerverified
Per 9 Inningsverified
1.278
1.278
Kevin Olsen
Career
Per 9 Innings
1.573
1.573
Jack Aker
Careerverified
Per 9 Innings
2786
33.61
Kevin Olsen
Career
Per 9 Inningsverified
323
35.17
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Kevin Olsen
Career
Per 9 Innings
1.82
1.82
Jack Aker
Careerverified
Per 9 Inningsverified
0.265
0.265
Kevin Olsen
Career
Per 9 Innings
0.34
0.34
Jack Aker
Career
Per 9 Innings
37.93
37.93
Kevin Olsen
Careerverified
Per 9 Inningsverified
40.06
40.06

Fielding Stats for Jack Aker and Kevin Olsen

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Kevin Olsen
Career
Per 9 Innings
3
3
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Kevin Olsen
Career
Per 9 Innings
28
3.05
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Careerverified
Per 9 Inningsverified
10
1.09
Jack Aker
Careerverified
Per 9 Innings
2240
27
Kevin Olsen
Career
Per 9 Innings
248
27
Jack Aker
Careerverified
Per 9 Innings
746.2
9
Kevin Olsen
Career
Per 9 Innings
82.2
9
Jack Aker
Careerverified
Per 9 Innings
65
0.78
Kevin Olsen
Career
Per 9 Inningsverified
11
1.2
Jack Aker
Careerverified
Per 9 Inningsverified
167
2.01
Kevin Olsen
Career
Per 9 Innings
6
0.65
Jack Aker
Career
Per 9 Inningsverified
8
0.1
Kevin Olsen
Careerverified
Per 9 Innings
1
0.11
Jack Aker
Careerverified
Per 9 Inningsverified
240
2.89
Kevin Olsen
Career
Per 9 Innings
18
1.96
Jack Aker
Careerverified
Per 9 Inningsverified
232
2.8
Kevin Olsen
Career
Per 9 Innings
17
1.85
Jack Aker
Careerverified
Per 9 Inningsverified
96.67
96.67
Kevin Olsen
Career
Per 9 Innings
94.44
94.44
Jack Aker
Career
Per 9 Innings
0.469
0.469
Kevin Olsen
Careerverified
Per 9 Inningsverified
0.607
0.607
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Careerverified
Per 9 Inningsverified
35.71
35.71
Jack Aker
Careerverified
Per 9 Inningsverified
20
0.24
Kevin Olsen
Career
Per 9 Innings
1
0.11
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Kevin Olsen
Career
Per 9 Innings
0
0

Hitting Stats for Jack Aker and Kevin Olsen

Jack Aker
Careerverified
Per 600 PAverified
11
11
Kevin Olsen
Career
Per 600 PA
3
3
Jack Aker
Careerverified
Per 600 PAverified
496
2861.54
Kevin Olsen
Career
Per 600 PA
28
1050
Jack Aker
Careerverified
Per 600 PA
104
600
Kevin Olsen
Career
Per 600 PA
16
600
Jack Aker
Careerverified
Per 600 PA
92
530.77
Kevin Olsen
Career
Per 600 PAverified
15
562.5
Jack Aker
Careerverified
Per 600 PAverified
0.076
0.076
Kevin Olsen
Career
Per 600 PA
0.067
0.067
Jack Aker
Careerverified
Per 600 PAverified
0.279
0.279
Kevin Olsen
Career
Per 600 PA
0.188
0.188
Jack Aker
Careerverified
Per 600 PAverified
7
40.38
Kevin Olsen
Career
Per 600 PA
1
37.5
Jack Aker
Careerverified
Per 600 PA
5
28.85
Kevin Olsen
Career
Per 600 PAverified
1
37.5
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
0.286
0.286
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
0.81
4.66
Kevin Olsen
Career
Per 600 PA
0.06
2.22
Jack Aker
Careerverified
Per 600 PAverified
9
51.92
Kevin Olsen
Career
Per 600 PA
1
37.5
Jack Aker
Careerverified
Per 600 PAverified
9
51.92
Kevin Olsen
Career
Per 600 PA
1
37.5
Jack Aker
Careerverified
Per 600 PAverified
0.096
0.096
Kevin Olsen
Career
Per 600 PA
0.067
0.067
Jack Aker
Careerverified
Per 600 PAverified
0.098
0.098
Kevin Olsen
Career
Per 600 PA
0.067
0.067
Jack Aker
Careerverified
Per 600 PAverified
0.194
0.194
Kevin Olsen
Career
Per 600 PA
0.133
0.133
Jack Aker
Careerverified
Per 600 PAverified
0.022
0.022
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
0.068
0.068
Kevin Olsen
Career
Per 600 PA
0.047
0.047
Jack Aker
Careerverified
Per 600 PAverified
0.128
0.128
Kevin Olsen
Career
Per 600 PA
0.071
0.071
Jack Aker
Career
Per 600 PA
0.171
0.171
Kevin Olsen
Careerverified
Per 600 PAverified
0.2
0.2
Jack Aker
Careerverified
Per 600 PAverified
3
17.31
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
4
23.08
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
7
40.38
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PAverified
-4.13
-23.83
Kevin Olsen
Careerverified
Per 600 PA
-0.9
-33.73
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PAverified
51
294.23
Kevin Olsen
Careerverified
Per 600 PA
10
375
Jack Aker
Careerverified
Per 600 PAverified
2.04
2.04
Kevin Olsen
Career
Per 600 PA
1.6
1.6
Jack Aker
Careerverified
Per 600 PAverified
0.02
0.02
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
10
57.69
Kevin Olsen
Career
Per 600 PA
1
37.5
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
1
5.77
Kevin Olsen
Careerverified
Per 600 PAverified
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Kevin Olsen
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
Kevin Olsen
Career
Per 600 PA