Mark Kiefer vs. Tom O'Brien — Career Comparison

You might be looking for a matchup, check Mark Kiefer's matchup page instead!

Mark Kiefer
Gen XCaliforniaThrows RightBats RightNorth AmericaMilwaukee BrewersAmerican LeagueRelief Pitcher
Tom O'Brien
Pre-GenerationalMassachusettsThrows RightBats RightNorth AmericaBoston RedsUnion AssociationSecond Baseman

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

Pitching Stats for Mark Kiefer and Tom O'Brien

Mark Kiefer
Careerverified
Per 9 Inningsverified
4
4
Tom O'Brien
Career
Per 9 Innings
1
1
Mark Kiefer
Careerverified
Per 9 Inningsverified
44
4.97
Tom O'Brien
Career
Per 9 Innings
1
2.45
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
5
0.56
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
83.33
83.33
Tom O'Brien
Career
Per 9 Innings
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
1
0.11
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Inningsverified
38
4.29
Tom O'Brien
Careerverified
Per 9 Innings
3
7.36
Mark Kiefer
Careerverified
Per 9 Inningsverified
4.29
4.29
Tom O'Brien
Career
Per 9 Innings
7.36
7.36
Mark Kiefer
Careerverified
Per 9 Inningsverified
4.33
4.33
Tom O'Brien
Career
Per 9 Innings
6.13
6.13
Mark Kiefer
Careerverified
Per 9 Inningsverified
5
5
Tom O'Brien
Career
Per 9 Innings
7.09
7.09
Mark Kiefer
Career
Per 9 Innings
0.237
0.237
Tom O'Brien
Careerverified
Per 9 Inningsverified
0.211
0.211
Mark Kiefer
Careerverified
Per 9 Innings
239
27
Tom O'Brien
Career
Per 9 Innings
11
27
Mark Kiefer
Careerverified
Per 9 Innings
79.2
9
Tom O'Brien
Career
Per 9 Innings
3.2
9
Mark Kiefer
Career
Per 9 Inningsverified
70
7.91
Tom O'Brien
Careerverified
Per 9 Innings
4
9.82
Mark Kiefer
Careerverified
Per 9 Inningsverified
7.91
7.91
Tom O'Brien
Career
Per 9 Innings
9.82
9.82
Mark Kiefer
Career
Per 9 Innings
11
1.24
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Innings
1.24
1.24
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Innings
0.25
0.25
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Inningsverified
45
5.08
Tom O'Brien
Careerverified
Per 9 Innings
5
12.27
Mark Kiefer
Career
Per 9 Innings
3
0.34
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
5.08
5.08
Tom O'Brien
Career
Per 9 Innings
12.27
12.27
Mark Kiefer
Careerverified
Per 9 Inningsverified
61
6.89
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
6.89
6.89
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
1.39
1.39
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
1.331
1.331
Tom O'Brien
Careerverified
Per 9 Inningsverified
1.364
1.364
Mark Kiefer
Career
Per 9 Innings
5
0.56
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Careerverified
Per 9 Innings
346
39.09
Tom O'Brien
Career
Per 9 Inningsverified
24
58.91
Mark Kiefer
Careerverified
Per 9 Inningsverified
14
1.58
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Inningsverified
41
4.63
Tom O'Brien
Careerverified
Per 9 Innings
5
12.27
Mark Kiefer
Careerverified
Per 9 Inningsverified
4.63
4.63
Tom O'Brien
Career
Per 9 Innings
12.27
12.27
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Career
Per 9 Innings
3
0.34
Tom O'Brien
Careerverified
Per 9 Inningsverified
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
9
1.02
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Inningsverified
1.444
1.444
Tom O'Brien
Career
Per 9 Innings
2.455
2.455
Mark Kiefer
Careerverified
Per 9 Innings
296
33.44
Tom O'Brien
Career
Per 9 Inningsverified
19
46.64
Mark Kiefer
Careerverified
Per 9 Inningsverified
0.93
0.93
Tom O'Brien
Career
Per 9 Innings
5
5
Mark Kiefer
Career
Per 9 Innings
0.263
0.263
Tom O'Brien
Careerverified
Per 9 Inningsverified
0.211
0.211
Mark Kiefer
Career
Per 9 Innings
39.09
39.09
Tom O'Brien
Careerverified
Per 9 Inningsverified
58.91
58.91

Fielding Stats for Mark Kiefer and Tom O'Brien

Mark Kiefer
Career
Per 9 Innings
4
4
Tom O'Brien
Careerverified
Per 9 Inningsverified
6
6
Mark Kiefer
Career
Per 9 Inningsverified
44
4.97
Tom O'Brien
Careerverified
Per 9 Innings
278
1.04
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
239
27
Tom O'Brien
Careerverified
Per 9 Innings
7221
27
Mark Kiefer
Career
Per 9 Innings
79.2
9
Tom O'Brien
Careerverified
Per 9 Innings
2407
9
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
1353
5.06
Mark Kiefer
Career
Per 9 Innings
5
0.56
Tom O'Brien
Careerverified
Per 9 Inningsverified
433
1.62
Mark Kiefer
Careerverified
Per 9 Inningsverified
0
0
Tom O'Brien
Career
Per 9 Innings
187
0.7
Mark Kiefer
Career
Per 9 Innings
6
0.68
Tom O'Brien
Careerverified
Per 9 Inningsverified
1973
7.38
Mark Kiefer
Career
Per 9 Innings
6
0.68
Tom O'Brien
Careerverified
Per 9 Inningsverified
1786
6.68
Mark Kiefer
Careerverified
Per 9 Inningsverified
100
100
Tom O'Brien
Career
Per 9 Innings
90.52
90.52
Mark Kiefer
Career
Per 9 Innings
0.136
0.136
Tom O'Brien
Careerverified
Per 9 Inningsverified
6.425
6.425
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
1
0.11
Tom O'Brien
Careerverified
Per 9 Inningsverified
87
0.33
Mark Kiefer
Careerverified
Per 9 Inningsverified
0
0
Tom O'Brien
Career
Per 9 Innings
2
0.01
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
0
0
Tom O'Brien
Career
Per 9 Innings
0
0

Hitting Stats for Mark Kiefer and Tom O'Brien

Mark Kiefer
Career
Per 600 PA
4
Tom O'Brien
Careerverified
Per 600 PAverified
6
6
Mark Kiefer
Career
Per 600 PA
44
Tom O'Brien
Careerverified
Per 600 PAverified
270
139.06
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
1165
600
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
1111
572.19
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.231
0.231
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.609
0.609
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
257
132.36
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
183
94.25
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
50
25.75
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
20
10.3
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
4
2.06
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
74
38.11
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.288
0.288
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.004
0.004
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.016
0.016
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
100.55
51.79
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
359
184.89
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
311
160.17
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.267
0.267
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.323
0.323
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.59
0.59
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.092
0.092
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.201
0.201
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.502
0.502
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
0.234
0.234
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
158
81.37
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
61
31.42
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
215
110.73
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
109
56.14
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
2
1.03
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
52
26.78
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Careerverified
Per 600 PAverified
0
Tom O'Brien
Career
Per 600 PA
24
12.36
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
48.54
48.54
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
2.17
2.17
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
16
8.24
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Tom O'Brien
Careerverified
Per 600 PAverified
16
8.24
Mark Kiefer
Career
Per 600 PA
Tom O'Brien
Careerverified
Per 600 PAverified
100
100