Alex Mustaikis vs. Sean O'Sullivan — Career Comparison

Alex Mustaikis
Greatest GenerationMassachusettsThrows RightBats RightNorth AmericaBoston Red SoxAmerican LeagueRelief Pitcher
Sean O'Sullivan
MillenialCaliforniaThrows RightBats RightNorth AmericaKansas City RoyalsAmerican LeagueStarting Pitcher

Sean O'Sullivan built a career as a starting pitcher and Alex Mustaikis as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Sean O'Sullivan posted stronger surface numbers — ERA 6.01 and WHIP 1.616 compared to 9 and 2.000 for Alex Mustaikis. By the career numbers, Sean O'Sullivan had the better of this cross-role comparison — though era context would sharpen the verdict.

Pitching Stats for Alex Mustaikis and Sean O'Sullivan

Alex Mustaikis
Career
Per 9 Innings
1
1
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
7
7
Alex Mustaikis
Career
Per 9 Inningsverified
6
3.6
Sean O'Sullivan
Careerverified
Per 9 Innings
71
1.97
Alex Mustaikis
Career
Per 9 Innings
1
0.6
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
56
1.56
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
13
0.36
Alex Mustaikis
Careerverified
Per 9 Inningsverified
1
0.6
Sean O'Sullivan
Career
Per 9 Innings
23
0.64
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
36.11
36.11
Alex Mustaikis
Career
Per 9 Innings
16.67
16.67
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
78.87
78.87
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Careerverified
Per 9 Innings
15
9
Sean O'Sullivan
Career
Per 9 Inningsverified
216
6.01
Alex Mustaikis
Career
Per 9 Innings
9
9
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
6.01
6.01
Alex Mustaikis
Career
Per 9 Innings
5.98
5.98
Sean O'Sullivan
Career
Per 9 Innings
5.98
5.98
Alex Mustaikis
Career
Per 9 Innings
6.07
6.07
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
5.58
5.58
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0.246
0.246
Sean O'Sullivan
Career
Per 9 Innings
0.305
0.305
Alex Mustaikis
Career
Per 9 Innings
45
27
Sean O'Sullivan
Careerverified
Per 9 Innings
971
27
Alex Mustaikis
Career
Per 9 Innings
15
9
Sean O'Sullivan
Careerverified
Per 9 Innings
323.2
9
Alex Mustaikis
Careerverified
Per 9 Inningsverified
15
9
Sean O'Sullivan
Career
Per 9 Innings
398
11.07
Alex Mustaikis
Careerverified
Per 9 Inningsverified
9
9
Sean O'Sullivan
Career
Per 9 Innings
11.07
11.07
Alex Mustaikis
Careerverified
Per 9 Inningsverified
1
0.6
Sean O'Sullivan
Career
Per 9 Innings
59
1.64
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0.6
0.6
Sean O'Sullivan
Career
Per 9 Innings
1.64
1.64
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0.17
0.17
Sean O'Sullivan
Career
Per 9 Innings
0.83
0.83
Alex Mustaikis
Careerverified
Per 9 Innings
15
9
Sean O'Sullivan
Career
Per 9 Inningsverified
115
3.2
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0
0
Sean O'Sullivan
Career
Per 9 Innings
10
0.28
Alex Mustaikis
Career
Per 9 Innings
9
9
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
3.2
3.2
Alex Mustaikis
Career
Per 9 Innings
6
3.6
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
158
4.39
Alex Mustaikis
Career
Per 9 Innings
3.6
3.6
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
4.39
4.39
Alex Mustaikis
Career
Per 9 Innings
1
1
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
2.23
2.23
Alex Mustaikis
Careerverified
Per 9 Inningsverified
1.4
1.4
Sean O'Sullivan
Career
Per 9 Innings
0.844
0.844
Alex Mustaikis
Careerverified
Per 9 Innings
1
0.6
Sean O'Sullivan
Career
Per 9 Inningsverified
13
0.36
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0
0
Sean O'Sullivan
Career
Per 9 Innings
13
0.36
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0
0
Sean O'Sullivan
Career
Per 9 Innings
2
0.06
Alex Mustaikis
Career
Per 9 Inningsverified
76
45.6
Sean O'Sullivan
Careerverified
Per 9 Innings
1464
40.71
Alex Mustaikis
Career
Per 9 Inningsverified
3
1.8
Sean O'Sullivan
Careerverified
Per 9 Innings
9
0.25
Alex Mustaikis
Careerverified
Per 9 Innings
18
10.8
Sean O'Sullivan
Career
Per 9 Inningsverified
226
6.28
Alex Mustaikis
Career
Per 9 Innings
10.8
10.8
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
6.28
6.28
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0
0
Sean O'Sullivan
Career
Per 9 Innings
11
0.31
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0
0
Sean O'Sullivan
Career
Per 9 Innings
19
0.53
Alex Mustaikis
Career
Per 9 Innings
0
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
32
0.89
Alex Mustaikis
Career
Per 9 Innings
2
2
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
1.585
1.585
Alex Mustaikis
Career
Per 9 Inningsverified
61
36.6
Sean O'Sullivan
Careerverified
Per 9 Innings
1306
36.32
Alex Mustaikis
Careerverified
Per 9 Inningsverified
3
3
Sean O'Sullivan
Career
Per 9 Innings
3.18
3.18
Alex Mustaikis
Careerverified
Per 9 Inningsverified
0.259
0.259
Sean O'Sullivan
Career
Per 9 Innings
0.311
0.311
Alex Mustaikis
Careerverified
Per 9 Inningsverified
45.6
45.6
Sean O'Sullivan
Career
Per 9 Innings
40.71
40.71

Fielding Stats for Alex Mustaikis and Sean O'Sullivan

Alex Mustaikis
Career
Per 9 Innings
1
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
7
7
Alex Mustaikis
Career
Per 9 Innings
6
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
71
1.97
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
56
1.56
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
971
27
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
323.2
9
Alex Mustaikis
Career
Per 9 Innings
2
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
22
0.61
Alex Mustaikis
Career
Per 9 Innings
7
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
31
0.86
Alex Mustaikis
Careerverified
Per 9 Inningsverified
1
Sean O'Sullivan
Career
Per 9 Innings
3
0.08
Alex Mustaikis
Career
Per 9 Innings
10
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
56
1.56
Alex Mustaikis
Career
Per 9 Innings
9
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
53
1.47
Alex Mustaikis
Career
Per 9 Innings
90
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
94.64
94.64
Alex Mustaikis
Careerverified
Per 9 Innings
1.5
Sean O'Sullivan
Career
Per 9 Inningsverified
0.747
0.747
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
78.87
78.87
Alex Mustaikis
Career
Per 9 Innings
1
Sean O'Sullivan
Careerverified
Per 9 Inningsverified
2
0.06
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Career
Per 9 Innings
0
0
Alex Mustaikis
Career
Per 9 Innings
0
Sean O'Sullivan
Career
Per 9 Innings
0
0

Hitting Stats for Alex Mustaikis and Sean O'Sullivan

Alex Mustaikis
Career
Per 600 PA
1
1
Sean O'Sullivan
Careerverified
Per 600 PAverified
7
7
Alex Mustaikis
Career
Per 600 PA
6
600
Sean O'Sullivan
Careerverified
Per 600 PAverified
71
1183.33
Alex Mustaikis
Career
Per 600 PA
6
600
Sean O'Sullivan
Careerverified
Per 600 PA
36
600
Alex Mustaikis
Career
Per 600 PAverified
6
600
Sean O'Sullivan
Careerverified
Per 600 PA
33
550
Alex Mustaikis
Careerverified
Per 600 PAverified
0.333
0.333
Sean O'Sullivan
Career
Per 600 PA
0.121
0.121
Alex Mustaikis
Careerverified
Per 600 PAverified
0.833
0.833
Sean O'Sullivan
Career
Per 600 PA
0.375
0.375
Alex Mustaikis
Career
Per 600 PAverified
2
200
Sean O'Sullivan
Careerverified
Per 600 PA
4
66.67
Alex Mustaikis
Career
Per 600 PAverified
1
100
Sean O'Sullivan
Careerverified
Per 600 PA
2
33.33
Alex Mustaikis
Career
Per 600 PAverified
1
100
Sean O'Sullivan
Careerverified
Per 600 PA
2
33.33
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PAverified
1
100
Sean O'Sullivan
Careerverified
Per 600 PA
2
33.33
Alex Mustaikis
Career
Per 600 PA
0.5
0.5
Sean O'Sullivan
Career
Per 600 PA
0.5
0.5
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PAverified
0.9
90.41
Sean O'Sullivan
Careerverified
Per 600 PA
0.94
15.66
Alex Mustaikis
Career
Per 600 PAverified
3
300
Sean O'Sullivan
Careerverified
Per 600 PA
6
100
Alex Mustaikis
Career
Per 600 PAverified
2
200
Sean O'Sullivan
Careerverified
Per 600 PA
5
83.33
Alex Mustaikis
Careerverified
Per 600 PAverified
0.333
0.333
Sean O'Sullivan
Career
Per 600 PA
0.147
0.147
Alex Mustaikis
Careerverified
Per 600 PAverified
0.5
0.5
Sean O'Sullivan
Career
Per 600 PA
0.182
0.182
Alex Mustaikis
Careerverified
Per 600 PAverified
0.833
0.833
Sean O'Sullivan
Career
Per 600 PA
0.329
0.329
Alex Mustaikis
Careerverified
Per 600 PAverified
0.167
0.167
Sean O'Sullivan
Career
Per 600 PA
0.061
0.061
Alex Mustaikis
Careerverified
Per 600 PAverified
0.275
0.275
Sean O'Sullivan
Career
Per 600 PA
0.112
0.112
Alex Mustaikis
Careerverified
Per 600 PAverified
0.75
0.75
Sean O'Sullivan
Career
Per 600 PA
0.241
0.241
Alex Mustaikis
Careerverified
Per 600 PAverified
0.5
0.5
Sean O'Sullivan
Career
Per 600 PA
0.25
0.25
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Careerverified
Per 600 PAverified
3
50
Alex Mustaikis
Careerverified
Per 600 PAverified
3
300
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PAverified
3
300
Sean O'Sullivan
Career
Per 600 PA
3
50
Alex Mustaikis
Careerverified
Per 600 PAverified
0.94
93.53
Sean O'Sullivan
Career
Per 600 PA
-0.11
-1.78
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Careerverified
Per 600 PAverified
1
16.67
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Careerverified
Per 600 PAverified
2
200
Sean O'Sullivan
Career
Per 600 PA
17
283.33
Alex Mustaikis
Careerverified
Per 600 PAverified
3
3
Sean O'Sullivan
Career
Per 600 PA
2.12
2.12
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Careerverified
Per 600 PAverified
0.06
0.06
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Careerverified
Per 600 PAverified
2
33.33
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
0
0
Sean O'Sullivan
Career
Per 600 PA
0
0
Alex Mustaikis
Career
Per 600 PA
Sean O'Sullivan
Career
Per 600 PA