Mark Kiefer vs. Jack 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
Jack O'Brien
Pre-GenerationalPennsylvaniaThrows RightBats RightNorth AmericaPhiladelphia AthleticsAmerican AssociationCatcher

Jack 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 Jack O'Brien ever faced Mark Kiefer, check out their matchup page.

Fielding Stats for Mark Kiefer and Jack O'Brien

Mark Kiefer
Career
Per 9 Innings
4
4
Jack O'Brien
Careerverified
Per 9 Inningsverified
8
8
Mark Kiefer
Career
Per 9 Inningsverified
44
4.97
Jack O'Brien
Careerverified
Per 9 Innings
573
1.1
Mark Kiefer
Career
Per 9 Innings
0
0
Jack O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
239
27
Jack O'Brien
Careerverified
Per 9 Innings
14076
27
Mark Kiefer
Career
Per 9 Innings
79.2
9
Jack O'Brien
Careerverified
Per 9 Innings
4692
9
Mark Kiefer
Career
Per 9 Innings
1
0.11
Jack O'Brien
Careerverified
Per 9 Inningsverified
2908
5.58
Mark Kiefer
Career
Per 9 Innings
5
0.56
Jack O'Brien
Careerverified
Per 9 Inningsverified
619
1.19
Mark Kiefer
Careerverified
Per 9 Inningsverified
0
0
Jack O'Brien
Career
Per 9 Innings
311
0.6
Mark Kiefer
Career
Per 9 Innings
6
0.68
Jack O'Brien
Careerverified
Per 9 Inningsverified
3838
7.36
Mark Kiefer
Career
Per 9 Innings
6
0.68
Jack O'Brien
Careerverified
Per 9 Inningsverified
3527
6.77
Mark Kiefer
Careerverified
Per 9 Inningsverified
100
100
Jack O'Brien
Career
Per 9 Innings
91.9
91.9
Mark Kiefer
Career
Per 9 Innings
0.136
0.136
Jack O'Brien
Careerverified
Per 9 Inningsverified
6.155
6.155
Mark Kiefer
Career
Per 9 Innings
0
0
Jack O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Career
Per 9 Innings
1
0.11
Jack O'Brien
Careerverified
Per 9 Inningsverified
128
0.25
Mark Kiefer
Careerverified
Per 9 Inningsverified
0
0
Jack O'Brien
Career
Per 9 Innings
279
0.54
Mark Kiefer
Career
Per 9 Innings
0
0
Jack O'Brien
Career
Per 9 Innings
0
0
Mark Kiefer
Careerverified
Per 9 Innings
0
0
Jack O'Brien
Career
Per 9 Innings
2
0
Mark Kiefer
Career
Per 9 Innings
0
0
Jack O'Brien
Careerverified
Per 9 Innings
2
0

Hitting Stats for Mark Kiefer and Jack O'Brien

Mark Kiefer
Career
Per 600 PA
4
Jack O'Brien
Careerverified
Per 600 PAverified
8
8
Mark Kiefer
Career
Per 600 PA
44
Jack O'Brien
Careerverified
Per 600 PAverified
555
139.92
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
2380
600
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
2169
546.81
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.266
0.266
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.736
0.736
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
577
145.46
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
418
105.38
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
106
26.72
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
42
10.59
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
11
2.77
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
159
40.08
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.276
0.276
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.005
0.005
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.019
0.019
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
294.26
74.18
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
800
201.68
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
788
198.66
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.331
0.331
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.369
0.369
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.7
0.7
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.103
0.103
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.241
0.241
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.683
0.683
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
0.266
0.266
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
366
92.27
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
308
77.65
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
663
167.14
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
318.06
80.18
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
31
7.82
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
180
45.38
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Careerverified
Per 600 PAverified
0
Jack O'Brien
Career
Per 600 PA
31
7.82
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
76.77
76.77
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
5.81
5.81
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
76
19.16
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Career
Per 600 PA
0
0
Mark Kiefer
Career
Per 600 PA
0
Jack O'Brien
Careerverified
Per 600 PAverified
76
19.16
Mark Kiefer
Career
Per 600 PA
Jack O'Brien
Careerverified
Per 600 PAverified
100
100