Jack Aker vs. Mike Willis — Career Comparison

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Mike Willis
Baby BoomersOklahomaThrows LeftBats LeftNorth AmericaToronto Blue JaysAmerican LeagueRelief Pitcher

The numbers give Jack Aker a clear advantage over Mike Willis across the core pitching metrics. Jack Aker led in home run suppression (HR9+ 76 vs 61), run prevention (ERA+ 89 vs 81), and skill-based run prevention (DICE+ 88 vs 84). Mike Willis held the edge in strikeout rate (K%+ 87 vs 86). Jack Aker was the better reliever — the numbers make that case clearly.

Pitching Stats for Jack Aker and Mike Willis

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Mike Willis
Career
Per 9 Innings
5
5
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Mike Willis
Career
Per 9 Innings
144
4.38
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Careerverified
Per 9 Inningsverified
6
0.18
Jack Aker
Careerverified
Per 9 Inningsverified
47
0.57
Mike Willis
Career
Per 9 Innings
7
0.21
Jack Aker
Career
Per 9 Inningsverified
45
0.54
Mike Willis
Careerverified
Per 9 Innings
21
0.64
Jack Aker
Careerverified
Per 9 Inningsverified
51.09
51.09
Mike Willis
Career
Per 9 Innings
25
25
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Careerverified
Per 9 Inningsverified
4.17
4.17
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Careerverified
Per 9 Inningsverified
1
0.03
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Mike Willis
Career
Per 9 Innings
15
0.46
Jack Aker
Career
Per 9 Inningsverified
272
3.28
Mike Willis
Careerverified
Per 9 Innings
151
4.59
Jack Aker
Careerverified
Per 9 Inningsverified
3.28
3.28
Mike Willis
Career
Per 9 Innings
4.59
4.59
Jack Aker
Careerverified
Per 9 Inningsverified
3.45
3.45
Mike Willis
Career
Per 9 Innings
4.59
4.59
Jack Aker
Careerverified
Per 9 Inningsverified
4.29
4.29
Mike Willis
Career
Per 9 Innings
4.86
4.86
Jack Aker
Careerverified
Per 9 Inningsverified
0.244
0.244
Mike Willis
Career
Per 9 Innings
0.274
0.274
Jack Aker
Careerverified
Per 9 Innings
2238
27
Mike Willis
Career
Per 9 Innings
888
27
Jack Aker
Careerverified
Per 9 Innings
746
9
Mike Willis
Career
Per 9 Innings
296
9
Jack Aker
Career
Per 9 Inningsverified
679
8.19
Mike Willis
Careerverified
Per 9 Innings
312
9.49
Jack Aker
Careerverified
Per 9 Inningsverified
8.19
8.19
Mike Willis
Career
Per 9 Innings
9.49
9.49
Jack Aker
Career
Per 9 Inningsverified
64
0.77
Mike Willis
Careerverified
Per 9 Innings
36
1.09
Jack Aker
Careerverified
Per 9 Inningsverified
0.77
0.77
Mike Willis
Career
Per 9 Innings
1.09
1.09
Jack Aker
Careerverified
Per 9 Inningsverified
0.13
0.13
Mike Willis
Career
Per 9 Innings
0.25
0.25
Jack Aker
Career
Per 9 Inningsverified
274
3.31
Mike Willis
Careerverified
Per 9 Innings
124
3.77
Jack Aker
Career
Per 9 Innings
68
0.82
Mike Willis
Careerverified
Per 9 Inningsverified
15
0.46
Jack Aker
Careerverified
Per 9 Inningsverified
3.31
3.31
Mike Willis
Career
Per 9 Innings
3.77
3.77
Jack Aker
Careerverified
Per 9 Inningsverified
404
4.87
Mike Willis
Career
Per 9 Innings
149
4.53
Jack Aker
Careerverified
Per 9 Inningsverified
4.87
4.87
Mike Willis
Career
Per 9 Innings
4.53
4.53
Jack Aker
Career
Per 9 Innings
0.82
0.82
Mike Willis
Careerverified
Per 9 Inningsverified
1.03
1.03
Jack Aker
Career
Per 9 Innings
0.909
0.909
Mike Willis
Careerverified
Per 9 Inningsverified
0.922
0.922
Jack Aker
Career
Per 9 Inningsverified
13
0.16
Mike Willis
Careerverified
Per 9 Innings
9
0.27
Jack Aker
Career
Per 9 Innings
40
0.48
Mike Willis
Careerverified
Per 9 Inningsverified
3
0.09
Jack Aker
Careerverified
Per 9 Inningsverified
0
0
Mike Willis
Career
Per 9 Innings
1
0.03
Jack Aker
Careerverified
Per 9 Innings
3144
37.93
Mike Willis
Career
Per 9 Inningsverified
1295
39.38
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Mike Willis
Career
Per 9 Innings
71
2.16
Jack Aker
Career
Per 9 Inningsverified
312
3.76
Mike Willis
Careerverified
Per 9 Innings
161
4.9
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Mike Willis
Career
Per 9 Innings
4.9
4.9
Jack Aker
Career
Per 9 Inningsverified
32
0.39
Mike Willis
Careerverified
Per 9 Innings
19
0.58
Jack Aker
Career
Per 9 Inningsverified
12
0.14
Mike Willis
Career
Per 9 Innings
12
0.36
Jack Aker
Career
Per 9 Innings
19
0.23
Mike Willis
Careerverified
Per 9 Inningsverified
23
0.7
Jack Aker
Careerverified
Per 9 Inningsverified
1.278
1.278
Mike Willis
Career
Per 9 Innings
1.473
1.473
Jack Aker
Careerverified
Per 9 Innings
2786
33.61
Mike Willis
Career
Per 9 Inningsverified
1137
34.57
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Mike Willis
Career
Per 9 Innings
1.12
1.12
Jack Aker
Careerverified
Per 9 Inningsverified
0.265
0.265
Mike Willis
Career
Per 9 Innings
0.29
0.29
Jack Aker
Career
Per 9 Innings
37.93
37.93
Mike Willis
Careerverified
Per 9 Inningsverified
39.38
39.38

Fielding Stats for Jack Aker and Mike Willis

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Mike Willis
Career
Per 9 Innings
5
5
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Mike Willis
Career
Per 9 Innings
144
4.38
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Careerverified
Per 9 Inningsverified
6
0.18
Jack Aker
Careerverified
Per 9 Innings
2240
27
Mike Willis
Career
Per 9 Innings
888
27
Jack Aker
Careerverified
Per 9 Innings
746.2
9
Mike Willis
Career
Per 9 Innings
296
9
Jack Aker
Careerverified
Per 9 Inningsverified
65
0.78
Mike Willis
Career
Per 9 Innings
19
0.58
Jack Aker
Careerverified
Per 9 Inningsverified
167
2.01
Mike Willis
Career
Per 9 Innings
49
1.49
Jack Aker
Career
Per 9 Innings
8
0.1
Mike Willis
Careerverified
Per 9 Inningsverified
2
0.06
Jack Aker
Careerverified
Per 9 Inningsverified
240
2.89
Mike Willis
Career
Per 9 Innings
70
2.13
Jack Aker
Careerverified
Per 9 Inningsverified
232
2.8
Mike Willis
Career
Per 9 Innings
68
2.07
Jack Aker
Career
Per 9 Innings
96.67
96.67
Mike Willis
Careerverified
Per 9 Inningsverified
97.14
97.14
Jack Aker
Career
Per 9 Innings
0.469
0.469
Mike Willis
Careerverified
Per 9 Inningsverified
0.472
0.472
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Careerverified
Per 9 Inningsverified
4.17
4.17
Jack Aker
Careerverified
Per 9 Inningsverified
20
0.24
Mike Willis
Career
Per 9 Innings
2
0.06
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Mike Willis
Career
Per 9 Innings
0
0

Hitting Stats for Jack Aker and Mike Willis

Jack Aker
Careerverified
Per 600 PAverified
11
11
Mike Willis
Career
Per 600 PA
5
Jack Aker
Careerverified
Per 600 PAverified
496
2861.54
Mike Willis
Career
Per 600 PA
144
Jack Aker
Careerverified
Per 600 PAverified
104
600
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
92
530.77
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
0.076
0.076
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.279
0.279
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
7
40.38
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
5
28.85
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
0.286
0.286
Mike Willis
Career
Per 600 PA
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.81
4.66
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
9
51.92
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
9
51.92
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
0.096
0.096
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.098
0.098
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.194
0.194
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.022
0.022
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.068
0.068
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.128
0.128
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.171
0.171
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
3
17.31
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
4
23.08
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
7
40.38
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
-4.13
-23.83
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Mike Willis
Career
Per 600 PA
0
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
51
294.23
Mike Willis
Careerverified
Per 600 PAverified
0
Jack Aker
Careerverified
Per 600 PAverified
2.04
2.04
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
0.02
0.02
Mike Willis
Career
Per 600 PA
Jack Aker
Careerverified
Per 600 PAverified
10
57.69
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
1
5.77
Mike Willis
Careerverified
Per 600 PAverified
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
0
0
Mike Willis
Career
Per 600 PA
0
Jack Aker
Career
Per 600 PA
Mike Willis
Career
Per 600 PA