Jack Aker vs. Billy O'Brien — Career Comparison

You might be looking for a matchup, check Jack Aker's matchup page instead!

Jack Aker
Silent GenerationCaliforniaThrows RightBats RightNorth AmericaKansas City AthleticsAmerican LeagueRelief Pitcher
Billy O'Brien
Pre-GenerationalNew YorkThrows RightBats RightNorth AmericaWashington NationalsNational LeagueFirst Baseman

Billy O'Brien is a position player and Jack Aker a pitcher — the stats that define each role measure entirely different things, so a direct comparison doesn't hold up. If Billy O'Brien ever faced Jack Aker, check out their matchup page.

Pitching Stats for Jack Aker and Billy O'Brien

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Billy O'Brien
Career
Per 9 Innings
1
1
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Billy O'Brien
Career
Per 9 Innings
2
1.8
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Innings
47
0.57
Billy O'Brien
Career
Per 9 Inningsverified
1
0.9
Jack Aker
Career
Per 9 Innings
45
0.54
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
51.09
51.09
Billy O'Brien
Careerverified
Per 9 Inningsverified
100
100
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
123
1.48
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
272
3.28
Billy O'Brien
Careerverified
Per 9 Inningsverified
2
1.8
Jack Aker
Career
Per 9 Innings
3.28
3.28
Billy O'Brien
Careerverified
Per 9 Inningsverified
1.8
1.8
Jack Aker
Career
Per 9 Innings
3.45
3.45
Billy O'Brien
Careerverified
Per 9 Inningsverified
1.94
1.94
Jack Aker
Career
Per 9 Innings
4.29
4.29
Billy O'Brien
Careerverified
Per 9 Inningsverified
2.5
2.5
Jack Aker
Career
Per 9 Innings
0.244
0.244
Billy O'Brien
Careerverified
Per 9 Inningsverified
0.205
0.205
Jack Aker
Careerverified
Per 9 Innings
2238
27
Billy O'Brien
Career
Per 9 Innings
30
27
Jack Aker
Careerverified
Per 9 Innings
746
9
Billy O'Brien
Career
Per 9 Innings
10
9
Jack Aker
Career
Per 9 Innings
679
8.19
Billy O'Brien
Careerverified
Per 9 Inningsverified
8
7.2
Jack Aker
Career
Per 9 Innings
8.19
8.19
Billy O'Brien
Careerverified
Per 9 Inningsverified
7.2
7.2
Jack Aker
Career
Per 9 Innings
64
0.77
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
0.77
0.77
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
0.13
0.13
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
274
3.31
Billy O'Brien
Careerverified
Per 9 Inningsverified
3
2.7
Jack Aker
Career
Per 9 Innings
68
0.82
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
3.31
3.31
Billy O'Brien
Careerverified
Per 9 Inningsverified
2.7
2.7
Jack Aker
Careerverified
Per 9 Innings
404
4.87
Billy O'Brien
Career
Per 9 Inningsverified
7
6.3
Jack Aker
Career
Per 9 Innings
4.87
4.87
Billy O'Brien
Careerverified
Per 9 Inningsverified
6.3
6.3
Jack Aker
Career
Per 9 Innings
0.82
0.82
Billy O'Brien
Careerverified
Per 9 Inningsverified
3.5
3.5
Jack Aker
Career
Per 9 Innings
0.909
0.909
Billy O'Brien
Careerverified
Per 9 Inningsverified
1
1
Jack Aker
Career
Per 9 Inningsverified
13
0.16
Billy O'Brien
Careerverified
Per 9 Innings
1
0.9
Jack Aker
Career
Per 9 Innings
40
0.48
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
3144
37.93
Billy O'Brien
Career
Per 9 Innings
42
37.8
Jack Aker
Careerverified
Per 9 Inningsverified
321
3.87
Billy O'Brien
Career
Per 9 Innings
2
1.8
Jack Aker
Career
Per 9 Inningsverified
312
3.76
Billy O'Brien
Careerverified
Per 9 Innings
5
4.5
Jack Aker
Careerverified
Per 9 Inningsverified
3.76
3.76
Billy O'Brien
Career
Per 9 Innings
4.5
4.5
Jack Aker
Career
Per 9 Innings
32
0.39
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Career
Per 9 Innings
12
0.14
Billy O'Brien
Careerverified
Per 9 Inningsverified
0
0
Jack Aker
Careerverified
Per 9 Inningsverified
19
0.23
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
1.278
1.278
Billy O'Brien
Careerverified
Per 9 Inningsverified
1.1
1.1
Jack Aker
Careerverified
Per 9 Innings
2786
33.61
Billy O'Brien
Career
Per 9 Inningsverified
39
35.1
Jack Aker
Careerverified
Per 9 Inningsverified
0.63
0.63
Billy O'Brien
Career
Per 9 Innings
2.5
2.5
Jack Aker
Career
Per 9 Innings
0.265
0.265
Billy O'Brien
Careerverified
Per 9 Inningsverified
0.25
0.25
Jack Aker
Careerverified
Per 9 Inningsverified
37.93
37.93
Billy O'Brien
Career
Per 9 Innings
37.8
37.8

Fielding Stats for Jack Aker and Billy O'Brien

Jack Aker
Careerverified
Per 9 Inningsverified
11
11
Billy O'Brien
Career
Per 9 Innings
5
5
Jack Aker
Careerverified
Per 9 Inningsverified
495
5.97
Billy O'Brien
Career
Per 9 Innings
359
1.05
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
2240
27
Billy O'Brien
Careerverified
Per 9 Innings
9237
27
Jack Aker
Career
Per 9 Innings
746.2
9
Billy O'Brien
Careerverified
Per 9 Innings
3079
9
Jack Aker
Career
Per 9 Innings
65
0.78
Billy O'Brien
Careerverified
Per 9 Inningsverified
3507
10.25
Jack Aker
Careerverified
Per 9 Inningsverified
167
2.01
Billy O'Brien
Career
Per 9 Innings
141
0.41
Jack Aker
Careerverified
Per 9 Inningsverified
8
0.1
Billy O'Brien
Career
Per 9 Innings
107
0.31
Jack Aker
Career
Per 9 Innings
240
2.89
Billy O'Brien
Careerverified
Per 9 Inningsverified
3755
10.98
Jack Aker
Career
Per 9 Innings
232
2.8
Billy O'Brien
Careerverified
Per 9 Inningsverified
3648
10.66
Jack Aker
Career
Per 9 Innings
96.67
96.67
Billy O'Brien
Careerverified
Per 9 Inningsverified
97.15
97.15
Jack Aker
Career
Per 9 Innings
0.469
0.469
Billy O'Brien
Careerverified
Per 9 Inningsverified
10.162
10.162
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
20
0.24
Billy O'Brien
Careerverified
Per 9 Inningsverified
175
0.51
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0
Jack Aker
Career
Per 9 Innings
0
0
Billy O'Brien
Career
Per 9 Innings
0
0

Hitting Stats for Jack Aker and Billy O'Brien

Jack Aker
Careerverified
Per 600 PAverified
11
11
Billy O'Brien
Career
Per 600 PA
5
5
Jack Aker
Careerverified
Per 600 PAverified
496
2861.54
Billy O'Brien
Career
Per 600 PA
356
143.26
Jack Aker
Career
Per 600 PA
104
600
Billy O'Brien
Careerverified
Per 600 PA
1491
600
Jack Aker
Career
Per 600 PA
92
530.77
Billy O'Brien
Careerverified
Per 600 PAverified
1424
573.04
Jack Aker
Career
Per 600 PA
0.076
0.076
Billy O'Brien
Careerverified
Per 600 PAverified
0.256
0.256
Jack Aker
Career
Per 600 PA
0.279
0.279
Billy O'Brien
Careerverified
Per 600 PAverified
0.703
0.703
Jack Aker
Career
Per 600 PA
7
40.38
Billy O'Brien
Careerverified
Per 600 PAverified
364
146.48
Jack Aker
Career
Per 600 PA
5
28.85
Billy O'Brien
Careerverified
Per 600 PAverified
251
101.01
Jack Aker
Career
Per 600 PA
2
11.54
Billy O'Brien
Careerverified
Per 600 PAverified
59
23.74
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
22
8.85
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
32
12.88
Jack Aker
Career
Per 600 PA
2
11.54
Billy O'Brien
Careerverified
Per 600 PAverified
113
45.47
Jack Aker
Career
Per 600 PA
0.286
0.286
Billy O'Brien
Careerverified
Per 600 PAverified
0.31
0.31
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
0.023
0.023
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
0.088
0.088
Jack Aker
Career
Per 600 PA
0.81
4.66
Billy O'Brien
Careerverified
Per 600 PAverified
169
68.01
Jack Aker
Career
Per 600 PA
9
51.92
Billy O'Brien
Careerverified
Per 600 PAverified
563
226.56
Jack Aker
Career
Per 600 PA
9
51.92
Billy O'Brien
Careerverified
Per 600 PAverified
431
173.44
Jack Aker
Career
Per 600 PA
0.096
0.096
Billy O'Brien
Careerverified
Per 600 PAverified
0.289
0.289
Jack Aker
Career
Per 600 PA
0.098
0.098
Billy O'Brien
Careerverified
Per 600 PAverified
0.395
0.395
Jack Aker
Career
Per 600 PA
0.194
0.194
Billy O'Brien
Careerverified
Per 600 PAverified
0.685
0.685
Jack Aker
Career
Per 600 PA
0.022
0.022
Billy O'Brien
Careerverified
Per 600 PAverified
0.14
0.14
Jack Aker
Career
Per 600 PA
0.068
0.068
Billy O'Brien
Careerverified
Per 600 PAverified
0.229
0.229
Jack Aker
Career
Per 600 PA
0.128
0.128
Billy O'Brien
Careerverified
Per 600 PAverified
0.619
0.619
Jack Aker
Career
Per 600 PA
0.171
0.171
Billy O'Brien
Careerverified
Per 600 PAverified
0.255
0.255
Jack Aker
Career
Per 600 PA
3
17.31
Billy O'Brien
Careerverified
Per 600 PAverified
164
66
Jack Aker
Career
Per 600 PA
4
23.08
Billy O'Brien
Careerverified
Per 600 PAverified
206
82.9
Jack Aker
Career
Per 600 PA
7
40.38
Billy O'Brien
Careerverified
Per 600 PAverified
338
136.02
Jack Aker
Career
Per 600 PA
-4.13
-23.83
Billy O'Brien
Careerverified
Per 600 PAverified
182.19
73.32
Jack Aker
Career
Per 600 PAverified
1
5.77
Billy O'Brien
Careerverified
Per 600 PA
8
3.22
Jack Aker
Career
Per 600 PA
1
5.77
Billy O'Brien
Careerverified
Per 600 PAverified
59
23.74
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Career
Per 600 PA
0
0
Jack Aker
Careerverified
Per 600 PA
51
294.23
Billy O'Brien
Career
Per 600 PAverified
88
35.41
Jack Aker
Career
Per 600 PA
2.04
2.04
Billy O'Brien
Careerverified
Per 600 PAverified
16.94
16.94
Jack Aker
Career
Per 600 PA
0.02
0.02
Billy O'Brien
Careerverified
Per 600 PAverified
0.67
0.67
Jack Aker
Careerverified
Per 600 PAverified
10
57.69
Billy O'Brien
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
1
5.77
Billy O'Brien
Careerverified
Per 600 PAverified
0
0
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
26
10.46
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Career
Per 600 PA
0
0
Jack Aker
Career
Per 600 PA
0
0
Billy O'Brien
Careerverified
Per 600 PAverified
26
10.46
Jack Aker
Career
Per 600 PA
Billy O'Brien
Careerverified
Per 600 PAverified
100
100