Zach McClellan vs. Buck O'Brien — Career Comparison

Zach McClellan
Gen XOhioThrows RightBats RightNorth AmericaColorado RockiesNational LeagueRelief Pitcher
Buck O'Brien
Pre-GenerationalMassachusettsThrows RightBats RightNorth AmericaBoston Red SoxAmerican LeagueStarting Pitcher

Buck O'Brien built a career as a starting pitcher and Zach McClellan as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Buck O'Brien posted stronger surface numbers — ERA 2.63 and WHIP 1.273 compared to 5.79 and 1.929 for Zach McClellan. By the career numbers, Buck O'Brien had the better of this cross-role comparison — though era context would sharpen the verdict.

Pitching Stats for Zach McClellan and Buck O'Brien

Zach McClellan
Career
Per 9 Innings
1
1
Buck O'Brien
Careerverified
Per 9 Inningsverified
3
3
Zach McClellan
Career
Per 9 Inningsverified
12
7.71
Buck O'Brien
Careerverified
Per 9 Innings
64
1.33
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Inningsverified
54
1.13
Zach McClellan
Career
Per 9 Inningsverified
1
0.64
Buck O'Brien
Careerverified
Per 9 Innings
29
0.6
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
25
0.52
Zach McClellan
Careerverified
Per 9 Inningsverified
100
100
Buck O'Brien
Career
Per 9 Innings
53.7
53.7
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Inningsverified
84.38
84.38
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Inningsverified
36
0.75
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Inningsverified
4
0.08
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
0
Zach McClellan
Careerverified
Per 9 Innings
9
5.79
Buck O'Brien
Career
Per 9 Inningsverified
126
2.63
Zach McClellan
Career
Per 9 Innings
5.79
5.79
Buck O'Brien
Careerverified
Per 9 Inningsverified
2.63
2.63
Zach McClellan
Career
Per 9 Innings
5.57
5.57
Buck O'Brien
Careerverified
Per 9 Inningsverified
3.06
3.06
Zach McClellan
Careerverified
Per 9 Inningsverified
2.21
2.21
Buck O'Brien
Career
Per 9 Innings
3.33
3.33
Zach McClellan
Career
Per 9 Innings
0.351
0.351
Buck O'Brien
Careerverified
Per 9 Inningsverified
0.249
0.249
Zach McClellan
Career
Per 9 Innings
42
27
Buck O'Brien
Careerverified
Per 9 Innings
1296
27
Zach McClellan
Career
Per 9 Innings
14
9
Buck O'Brien
Careerverified
Per 9 Innings
432
9
Zach McClellan
Careerverified
Per 9 Innings
20
12.86
Buck O'Brien
Career
Per 9 Inningsverified
391
8.15
Zach McClellan
Career
Per 9 Innings
12.86
12.86
Buck O'Brien
Careerverified
Per 9 Inningsverified
8.15
8.15
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
3
0.06
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
0.06
0.06
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
0.05
0.05
Zach McClellan
Careerverified
Per 9 Inningsverified
5
3.21
Buck O'Brien
Career
Per 9 Innings
159
3.31
Zach McClellan
Career
Per 9 Innings
2
1.29
Buck O'Brien
Careerverified
Per 9 Inningsverified
0
0
Zach McClellan
Careerverified
Per 9 Inningsverified
3.21
3.21
Buck O'Brien
Career
Per 9 Innings
3.31
3.31
Zach McClellan
Career
Per 9 Inningsverified
13
8.36
Buck O'Brien
Careerverified
Per 9 Innings
204
4.25
Zach McClellan
Careerverified
Per 9 Inningsverified
8.36
8.36
Buck O'Brien
Career
Per 9 Innings
4.25
4.25
Zach McClellan
Career
Per 9 Innings
1.08
1.08
Buck O'Brien
Careerverified
Per 9 Inningsverified
3.19
3.19
Zach McClellan
Careerverified
Per 9 Inningsverified
1.286
1.286
Buck O'Brien
Career
Per 9 Innings
0.84
0.84
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
6
0.13
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
11
0.23
Zach McClellan
Careerverified
Per 9 Inningsverified
0
0
Buck O'Brien
Career
Per 9 Innings
1
0.02
Zach McClellan
Career
Per 9 Inningsverified
63
40.5
Buck O'Brien
Careerverified
Per 9 Innings
1741
36.27
Zach McClellan
Career
Per 9 Inningsverified
1
0.64
Buck O'Brien
Careerverified
Per 9 Innings
7
0.15
Zach McClellan
Careerverified
Per 9 Innings
9
5.79
Buck O'Brien
Career
Per 9 Inningsverified
172
3.58
Zach McClellan
Career
Per 9 Innings
5.79
5.79
Buck O'Brien
Careerverified
Per 9 Inningsverified
3.58
3.58
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
0
Zach McClellan
Career
Per 9 Innings
1
0.64
Buck O'Brien
Careerverified
Per 9 Inningsverified
0
0
Zach McClellan
Careerverified
Per 9 Inningsverified
3
1.93
Buck O'Brien
Career
Per 9 Innings
0
0
Zach McClellan
Career
Per 9 Innings
1.786
1.786
Buck O'Brien
Careerverified
Per 9 Inningsverified
1.273
1.273
Zach McClellan
Career
Per 9 Inningsverified
57
36.64
Buck O'Brien
Careerverified
Per 9 Innings
1571
32.73
Zach McClellan
Careerverified
Per 9 Inningsverified
0.75
0.75
Buck O'Brien
Career
Per 9 Innings
2.69
2.69
Zach McClellan
Career
Per 9 Innings
0.455
0.455
Buck O'Brien
Careerverified
Per 9 Inningsverified
0.285
0.285
Zach McClellan
Careerverified
Per 9 Inningsverified
40.5
40.5
Buck O'Brien
Career
Per 9 Innings
36.27
36.27

Fielding Stats for Zach McClellan and Buck O'Brien

Zach McClellan
Career
Per 9 Inningsverified
1
1
Buck O'Brien
Careerverified
Per 9 Innings
3
Zach McClellan
Career
Per 9 Inningsverified
12
7.71
Buck O'Brien
Careerverified
Per 9 Innings
64
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Careerverified
Per 9 Inningsverified
42
27
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Careerverified
Per 9 Inningsverified
14
9
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Innings
15
Zach McClellan
Career
Per 9 Inningsverified
4
2.57
Buck O'Brien
Careerverified
Per 9 Innings
130
Zach McClellan
Careerverified
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
5
Zach McClellan
Career
Per 9 Inningsverified
4
2.57
Buck O'Brien
Careerverified
Per 9 Innings
150
Zach McClellan
Career
Per 9 Inningsverified
4
2.57
Buck O'Brien
Careerverified
Per 9 Innings
145
Zach McClellan
Careerverified
Per 9 Inningsverified
100
100
Buck O'Brien
Career
Per 9 Innings
96.67
Zach McClellan
Career
Per 9 Inningsverified
0.333
0.333
Buck O'Brien
Careerverified
Per 9 Innings
2.266
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Careerverified
Per 9 Innings
2
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0
Zach McClellan
Career
Per 9 Innings
0
0
Buck O'Brien
Career
Per 9 Innings
0

Hitting Stats for Zach McClellan and Buck O'Brien

Zach McClellan
Career
Per 600 PA
1
1
Buck O'Brien
Careerverified
Per 600 PAverified
3
3
Zach McClellan
Career
Per 600 PAverified
12
7200
Buck O'Brien
Careerverified
Per 600 PA
64
244.59
Zach McClellan
Career
Per 600 PA
1
600
Buck O'Brien
Careerverified
Per 600 PA
157
600
Zach McClellan
Career
Per 600 PAverified
1
600
Buck O'Brien
Careerverified
Per 600 PA
143
546.5
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.14
0.14
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.405
0.405
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
20
76.43
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
16
61.15
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
3
11.46
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
1
3.82
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
4
15.29
Zach McClellan
Career
Per 600 PA
Buck O'Brien
Careerverified
Per 600 PAverified
0.2
0.2
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
5.11
19.52
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
25
95.54
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
29
110.83
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.191
0.191
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.175
0.175
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.366
0.366
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.035
0.035
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.13
0.13
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.276
0.276
Zach McClellan
Career
Per 600 PA
Buck O'Brien
Careerverified
Per 600 PAverified
0.194
0.194
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
6
22.93
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
8
30.57
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
14
53.5
Zach McClellan
Career
Per 600 PA
-0.11
-66.4
Buck O'Brien
Careerverified
Per 600 PAverified
3.03
11.58
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
9
34.39
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Careerverified
Per 600 PA
1
600
Buck O'Brien
Career
Per 600 PAverified
40
152.87
Zach McClellan
Career
Per 600 PA
1
1
Buck O'Brien
Careerverified
Per 600 PAverified
3.93
3.93
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
0.23
0.23
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Careerverified
Per 600 PAverified
5
19.11
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
0
0
Buck O'Brien
Career
Per 600 PA
0
0
Zach McClellan
Career
Per 600 PA
Buck O'Brien
Career
Per 600 PA