Jack Aker vs. Willis Roberts — Career Comparison

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Willis Roberts
Gen XD.R.Throws RightBats RightCaribbeanBaltimore OriolesAmerican LeagueRelief Pitcher

The numbers give Willis Roberts a clear advantage over Jack Aker across the core pitching metrics. Willis Roberts led in home run suppression (HR9+ 113 vs 76), run prevention (ERA+ 97 vs 89), and skill-based run prevention (DICE+ 94 vs 88). Jack Aker held the edge in walk avoidance (BB%+ 100 vs 100). Willis Roberts was the better reliever — the numbers make that case clearly.

Pitching Stats for Jack Aker and Willis Roberts

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Willis Roberts
Career
Per 9 Innings
5
5
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Willis Roberts
Career
Per 9 Innings
148
5.13
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Careerverified
Per 9 Inningsverified
18
0.62
Jack Aker
Careerverified
Per 9 Innings
47
0.57
Willis Roberts
Career
Per 9 Inningsverified
17
0.59
Jack Aker
Career
Per 9 Innings
45
0.54
Willis Roberts
Careerverified
Per 9 Inningsverified
15
0.52
Jack Aker
Career
Per 9 Innings
51.09
51.09
Willis Roberts
Careerverified
Per 9 Inningsverified
53.13
53.13
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Careerverified
Per 9 Inningsverified
12.16
12.16
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Careerverified
Per 9 Inningsverified
1
0.03
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Willis Roberts
Career
Per 9 Innings
7
0.24
Jack Aker
Career
Per 9 Inningsverified
272
3.28
Willis Roberts
Careerverified
Per 9 Innings
134
4.64
Jack Aker
Careerverified
Per 9 Inningsverified
3.28
3.28
Willis Roberts
Career
Per 9 Innings
4.64
4.64
Jack Aker
Careerverified
Per 9 Inningsverified
3.45
3.45
Willis Roberts
Career
Per 9 Innings
4.97
4.97
Jack Aker
Careerverified
Per 9 Inningsverified
4.29
4.29
Willis Roberts
Career
Per 9 Innings
4.56
4.56
Jack Aker
Careerverified
Per 9 Inningsverified
0.244
0.244
Willis Roberts
Career
Per 9 Innings
0.274
0.274
Jack Aker
Careerverified
Per 9 Innings
2238
27
Willis Roberts
Career
Per 9 Innings
779
27
Jack Aker
Careerverified
Per 9 Innings
746
9
Willis Roberts
Career
Per 9 Innings
259.2
9
Jack Aker
Career
Per 9 Inningsverified
679
8.19
Willis Roberts
Careerverified
Per 9 Innings
277
9.6
Jack Aker
Careerverified
Per 9 Inningsverified
8.19
8.19
Willis Roberts
Career
Per 9 Innings
9.6
9.6
Jack Aker
Career
Per 9 Inningsverified
64
0.77
Willis Roberts
Careerverified
Per 9 Innings
27
0.94
Jack Aker
Careerverified
Per 9 Inningsverified
0.77
0.77
Willis Roberts
Career
Per 9 Innings
0.94
0.94
Jack Aker
Careerverified
Per 9 Inningsverified
0.13
0.13
Willis Roberts
Career
Per 9 Innings
0.18
0.18
Jack Aker
Career
Per 9 Inningsverified
274
3.31
Willis Roberts
Careerverified
Per 9 Innings
112
3.88
Jack Aker
Career
Per 9 Innings
68
0.82
Willis Roberts
Careerverified
Per 9 Inningsverified
6
0.21
Jack Aker
Careerverified
Per 9 Inningsverified
3.31
3.31
Willis Roberts
Career
Per 9 Innings
3.88
3.88
Jack Aker
Careerverified
Per 9 Innings
404
4.87
Willis Roberts
Career
Per 9 Inningsverified
179
6.2
Jack Aker
Career
Per 9 Innings
4.87
4.87
Willis Roberts
Careerverified
Per 9 Inningsverified
6.2
6.2
Jack Aker
Career
Per 9 Innings
0.82
0.82
Willis Roberts
Careerverified
Per 9 Inningsverified
1.21
1.21
Jack Aker
Career
Per 9 Innings
0.909
0.909
Willis Roberts
Careerverified
Per 9 Inningsverified
1.121
1.121
Jack Aker
Career
Per 9 Inningsverified
13
0.16
Willis Roberts
Career
Per 9 Innings
13
0.45
Jack Aker
Career
Per 9 Inningsverified
40
0.48
Willis Roberts
Careerverified
Per 9 Innings
25
0.87
Jack Aker
Careerverified
Per 9 Inningsverified
0
0
Willis Roberts
Career
Per 9 Innings
2
0.07
Jack Aker
Careerverified
Per 9 Innings
3144
37.93
Willis Roberts
Career
Per 9 Inningsverified
1165
40.38
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Willis Roberts
Career
Per 9 Innings
54
1.87
Jack Aker
Career
Per 9 Inningsverified
312
3.76
Willis Roberts
Careerverified
Per 9 Innings
146
5.06
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Willis Roberts
Career
Per 9 Innings
5.06
5.06
Jack Aker
Career
Per 9 Innings
32
0.39
Willis Roberts
Careerverified
Per 9 Inningsverified
7
0.24
Jack Aker
Career
Per 9 Inningsverified
12
0.14
Willis Roberts
Careerverified
Per 9 Innings
11
0.38
Jack Aker
Career
Per 9 Innings
19
0.23
Willis Roberts
Careerverified
Per 9 Inningsverified
21
0.73
Jack Aker
Careerverified
Per 9 Inningsverified
1.278
1.278
Willis Roberts
Career
Per 9 Innings
1.498
1.498
Jack Aker
Careerverified
Per 9 Innings
2786
33.61
Willis Roberts
Career
Per 9 Inningsverified
1010
35.01
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Willis Roberts
Career
Per 9 Innings
0.99
0.99
Jack Aker
Careerverified
Per 9 Inningsverified
0.265
0.265
Willis Roberts
Career
Per 9 Innings
0.311
0.311
Jack Aker
Career
Per 9 Innings
37.93
37.93
Willis Roberts
Careerverified
Per 9 Inningsverified
40.38
40.38

Fielding Stats for Jack Aker and Willis Roberts

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Willis Roberts
Career
Per 9 Innings
5
5
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Willis Roberts
Career
Per 9 Innings
148
5.13
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Careerverified
Per 9 Inningsverified
18
0.62
Jack Aker
Careerverified
Per 9 Innings
2240
27
Willis Roberts
Career
Per 9 Innings
779
27
Jack Aker
Careerverified
Per 9 Innings
746.2
9
Willis Roberts
Career
Per 9 Innings
259.2
9
Jack Aker
Careerverified
Per 9 Inningsverified
65
0.78
Willis Roberts
Career
Per 9 Innings
15
0.52
Jack Aker
Careerverified
Per 9 Inningsverified
167
2.01
Willis Roberts
Career
Per 9 Innings
39
1.35
Jack Aker
Career
Per 9 Inningsverified
8
0.1
Willis Roberts
Careerverified
Per 9 Innings
5
0.17
Jack Aker
Careerverified
Per 9 Inningsverified
240
2.89
Willis Roberts
Career
Per 9 Innings
59
2.04
Jack Aker
Careerverified
Per 9 Inningsverified
232
2.8
Willis Roberts
Career
Per 9 Innings
54
1.87
Jack Aker
Careerverified
Per 9 Inningsverified
96.67
96.67
Willis Roberts
Career
Per 9 Innings
91.53
91.53
Jack Aker
Careerverified
Per 9 Inningsverified
0.469
0.469
Willis Roberts
Career
Per 9 Innings
0.365
0.365
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Careerverified
Per 9 Inningsverified
12.16
12.16
Jack Aker
Careerverified
Per 9 Inningsverified
20
0.24
Willis Roberts
Career
Per 9 Innings
1
0.03
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Willis Roberts
Career
Per 9 Innings
0
0

Hitting Stats for Jack Aker and Willis Roberts

Jack Aker
Careerverified
Per 600 PAverified
11
11
Willis Roberts
Career
Per 600 PA
5
5
Jack Aker
Careerverified
Per 600 PA
496
2861.54
Willis Roberts
Career
Per 600 PAverified
148
14800
Jack Aker
Careerverified
Per 600 PA
104
600
Willis Roberts
Career
Per 600 PA
6
600
Jack Aker
Careerverified
Per 600 PAverified
92
530.77
Willis Roberts
Career
Per 600 PA
5
500
Jack Aker
Career
Per 600 PA
0.076
0.076
Willis Roberts
Careerverified
Per 600 PAverified
0.2
0.2
Jack Aker
Career
Per 600 PA
0.279
0.279
Willis Roberts
Careerverified
Per 600 PAverified
0.5
0.5
Jack Aker
Careerverified
Per 600 PA
7
40.38
Willis Roberts
Career
Per 600 PAverified
1
100
Jack Aker
Careerverified
Per 600 PA
5
28.85
Willis Roberts
Career
Per 600 PAverified
1
100
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
2
11.54
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
0.286
0.286
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PA
0.81
4.66
Willis Roberts
Career
Per 600 PAverified
0.18
18.03
Jack Aker
Careerverified
Per 600 PA
9
51.92
Willis Roberts
Career
Per 600 PAverified
1
100
Jack Aker
Careerverified
Per 600 PA
9
51.92
Willis Roberts
Career
Per 600 PAverified
1
100
Jack Aker
Career
Per 600 PA
0.096
0.096
Willis Roberts
Careerverified
Per 600 PAverified
0.2
0.2
Jack Aker
Career
Per 600 PA
0.098
0.098
Willis Roberts
Careerverified
Per 600 PAverified
0.2
0.2
Jack Aker
Career
Per 600 PA
0.194
0.194
Willis Roberts
Careerverified
Per 600 PAverified
0.4
0.4
Jack Aker
Careerverified
Per 600 PAverified
0.022
0.022
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0.068
0.068
Willis Roberts
Careerverified
Per 600 PAverified
0.14
0.14
Jack Aker
Career
Per 600 PA
0.128
0.128
Willis Roberts
Careerverified
Per 600 PAverified
0.25
0.25
Jack Aker
Career
Per 600 PA
0.171
0.171
Willis Roberts
Careerverified
Per 600 PAverified
1
1
Jack Aker
Careerverified
Per 600 PAverified
3
17.31
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
4
23.08
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
7
40.38
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
-4.13
-23.83
Willis Roberts
Careerverified
Per 600 PAverified
0.18
18.45
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PAverified
1
5.77
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PAverified
51
294.23
Willis Roberts
Careerverified
Per 600 PA
4
400
Jack Aker
Careerverified
Per 600 PAverified
2.04
2.04
Willis Roberts
Career
Per 600 PA
1.5
1.5
Jack Aker
Careerverified
Per 600 PAverified
0.02
0.02
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PA
10
57.69
Willis Roberts
Career
Per 600 PAverified
1
100
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
1
5.77
Willis Roberts
Careerverified
Per 600 PAverified
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Willis Roberts
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
Willis Roberts
Career
Per 600 PA