Grant Jackson vs. Dave Koslo — Career Comparison

Grant Jackson
Silent GenerationOhioThrows LeftBats SwitchNorth AmericaPittsburgh PiratesNational LeagueRelief PitcherAll-Star
Dave Koslo
Greatest GenerationWisconsinThrows LeftBats LeftNorth AmericaNew York GiantsNational LeagueStarting Pitcher

Dave Koslo built a career as a starting pitcher and Grant Jackson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Grant Jackson posted stronger surface numbers — ERA 3.46 and WHIP 1.365 compared to 3.68 and 1.342 for Dave Koslo. By the career numbers, Grant Jackson had the better of this cross-role comparison — though era context would sharpen the verdict.

Pitching Stats for Grant Jackson and Dave Koslo

Grant Jackson
Careerverified
Per 9 Inningsverified
18
18
Dave Koslo
Career
Per 9 Innings
12
12
Grant Jackson
Careerverified
Per 9 Inningsverified
692
4.58
Dave Koslo
Career
Per 9 Innings
348
1.97
Grant Jackson
Career
Per 9 Innings
83
0.55
Dave Koslo
Careerverified
Per 9 Inningsverified
189
1.07
Grant Jackson
Career
Per 9 Inningsverified
86
0.57
Dave Koslo
Careerverified
Per 9 Innings
92
0.52
Grant Jackson
Careerverified
Per 9 Inningsverified
75
0.5
Dave Koslo
Career
Per 9 Innings
107
0.61
Grant Jackson
Careerverified
Per 9 Inningsverified
53.42
53.42
Dave Koslo
Career
Per 9 Innings
46.23
46.23
Grant Jackson
Career
Per 9 Innings
11.99
11.99
Dave Koslo
Careerverified
Per 9 Inningsverified
54.31
54.31
Grant Jackson
Career
Per 9 Innings
16
0.11
Dave Koslo
Careerverified
Per 9 Inningsverified
74
0.42
Grant Jackson
Career
Per 9 Innings
5
0.03
Dave Koslo
Careerverified
Per 9 Inningsverified
15
0.08
Grant Jackson
Careerverified
Per 9 Inningsverified
79
0.52
Dave Koslo
Career
Per 9 Innings
22
0.12
Grant Jackson
Careerverified
Per 9 Inningsverified
523
3.46
Dave Koslo
Career
Per 9 Innings
651
3.68
Grant Jackson
Careerverified
Per 9 Inningsverified
3.46
3.46
Dave Koslo
Career
Per 9 Innings
3.68
3.68
Grant Jackson
Careerverified
Per 9 Inningsverified
3.48
3.48
Dave Koslo
Career
Per 9 Innings
3.73
3.73
Grant Jackson
Careerverified
Per 9 Inningsverified
3.91
3.91
Dave Koslo
Career
Per 9 Innings
4.28
4.28
Grant Jackson
Careerverified
Per 9 Inningsverified
0.249
0.249
Dave Koslo
Career
Per 9 Innings
0.256
0.256
Grant Jackson
Career
Per 9 Innings
4076
27
Dave Koslo
Careerverified
Per 9 Innings
4774
27
Grant Jackson
Career
Per 9 Innings
1358.2
9
Dave Koslo
Careerverified
Per 9 Innings
1591.1
9
Grant Jackson
Careerverified
Per 9 Inningsverified
1272
8.43
Dave Koslo
Career
Per 9 Innings
1597
9.03
Grant Jackson
Careerverified
Per 9 Inningsverified
8.43
8.43
Dave Koslo
Career
Per 9 Innings
9.03
9.03
Grant Jackson
Careerverified
Per 9 Innings
109
0.72
Dave Koslo
Career
Per 9 Inningsverified
121
0.68
Grant Jackson
Career
Per 9 Innings
0.72
0.72
Dave Koslo
Careerverified
Per 9 Inningsverified
0.68
0.68
Grant Jackson
Careerverified
Per 9 Inningsverified
0.16
0.16
Dave Koslo
Career
Per 9 Innings
0.35
0.35
Grant Jackson
Careerverified
Per 9 Innings
511
3.38
Dave Koslo
Career
Per 9 Inningsverified
538
3.04
Grant Jackson
Career
Per 9 Innings
71
0.47
Dave Koslo
Careerverified
Per 9 Inningsverified
0
0
Grant Jackson
Career
Per 9 Innings
3.38
3.38
Dave Koslo
Careerverified
Per 9 Inningsverified
3.04
3.04
Grant Jackson
Careerverified
Per 9 Inningsverified
889
5.89
Dave Koslo
Career
Per 9 Innings
606
3.43
Grant Jackson
Careerverified
Per 9 Inningsverified
5.89
5.89
Dave Koslo
Career
Per 9 Innings
3.43
3.43
Grant Jackson
Career
Per 9 Innings
1.28
1.28
Dave Koslo
Careerverified
Per 9 Inningsverified
1.74
1.74
Grant Jackson
Careerverified
Per 9 Inningsverified
1.03
1.03
Dave Koslo
Career
Per 9 Innings
0.719
0.719
Grant Jackson
Career
Per 9 Innings
44
0.29
Dave Koslo
Careerverified
Per 9 Inningsverified
21
0.12
Grant Jackson
Career
Per 9 Innings
21
0.14
Dave Koslo
Careerverified
Per 9 Inningsverified
20
0.11
Grant Jackson
Career
Per 9 Innings
9
0.06
Dave Koslo
Careerverified
Per 9 Inningsverified
1
0.01
Grant Jackson
Career
Per 9 Innings
5749
38.08
Dave Koslo
Careerverified
Per 9 Inningsverified
6803
38.48
Grant Jackson
Careerverified
Per 9 Inningsverified
291
1.93
Dave Koslo
Career
Per 9 Innings
93
0.53
Grant Jackson
Careerverified
Per 9 Inningsverified
589
3.9
Dave Koslo
Career
Per 9 Innings
740
4.19
Grant Jackson
Careerverified
Per 9 Inningsverified
3.9
3.9
Dave Koslo
Career
Per 9 Innings
4.19
4.19
Grant Jackson
Career
Per 9 Innings
62
0.41
Dave Koslo
Careerverified
Per 9 Inningsverified
0
0
Grant Jackson
Career
Per 9 Innings
43
0.28
Dave Koslo
Careerverified
Per 9 Inningsverified
0
0
Grant Jackson
Careerverified
Per 9 Inningsverified
52
0.34
Dave Koslo
Career
Per 9 Innings
0
0
Grant Jackson
Careerverified
Per 9 Inningsverified
1.312
1.312
Dave Koslo
Career
Per 9 Innings
1.342
1.342
Grant Jackson
Career
Per 9 Innings
5112
33.86
Dave Koslo
Careerverified
Per 9 Inningsverified
6245
35.32
Grant Jackson
Careerverified
Per 9 Inningsverified
0.85
0.85
Dave Koslo
Career
Per 9 Innings
2.13
2.13
Grant Jackson
Career
Per 9 Innings
0.283
0.283
Dave Koslo
Careerverified
Per 9 Inningsverified
0.268
0.268
Grant Jackson
Career
Per 9 Innings
38.08
38.08
Dave Koslo
Careerverified
Per 9 Inningsverified
38.48
38.48

Fielding Stats for Grant Jackson and Dave Koslo

Grant Jackson
Careerverified
Per 9 Inningsverified
18
18
Dave Koslo
Career
Per 9 Innings
12
12
Grant Jackson
Careerverified
Per 9 Innings
692
4.58
Dave Koslo
Career
Per 9 Inningsverified
348
98.91
Grant Jackson
Careerverified
Per 9 Inningsverified
83
0.55
Dave Koslo
Career
Per 9 Innings
1
0.28
Grant Jackson
Careerverified
Per 9 Innings
4078
27
Dave Koslo
Career
Per 9 Innings
95
27
Grant Jackson
Careerverified
Per 9 Innings
1359.1
9
Dave Koslo
Career
Per 9 Innings
31.2
9
Grant Jackson
Career
Per 9 Innings
55
0.36
Dave Koslo
Careerverified
Per 9 Inningsverified
75
21.32
Grant Jackson
Career
Per 9 Innings
170
1.13
Dave Koslo
Careerverified
Per 9 Inningsverified
307
87.25
Grant Jackson
Career
Per 9 Inningsverified
16
0.11
Dave Koslo
Careerverified
Per 9 Innings
14
3.98
Grant Jackson
Career
Per 9 Innings
241
1.6
Dave Koslo
Careerverified
Per 9 Inningsverified
396
112.55
Grant Jackson
Career
Per 9 Innings
225
1.49
Dave Koslo
Careerverified
Per 9 Inningsverified
382
108.57
Grant Jackson
Career
Per 9 Innings
93.36
93.36
Dave Koslo
Careerverified
Per 9 Inningsverified
96.46
96.46
Grant Jackson
Career
Per 9 Innings
0.325
0.325
Dave Koslo
Careerverified
Per 9 Inningsverified
1.098
1.098
Grant Jackson
Careerverified
Per 9 Inningsverified
11.99
11.99
Dave Koslo
Career
Per 9 Innings
0.29
0.29
Grant Jackson
Career
Per 9 Innings
12
0.08
Dave Koslo
Careerverified
Per 9 Inningsverified
23
6.54
Grant Jackson
Career
Per 9 Innings
0
0
Dave Koslo
Career
Per 9 Innings
0
0
Grant Jackson
Career
Per 9 Innings
0
0
Dave Koslo
Career
Per 9 Innings
0
0
Grant Jackson
Career
Per 9 Innings
0
0
Dave Koslo
Career
Per 9 Innings
0
0
Grant Jackson
Career
Per 9 Innings
0
0
Dave Koslo
Career
Per 9 Innings
0
0

Hitting Stats for Grant Jackson and Dave Koslo

Grant Jackson
Careerverified
Per 600 PAverified
18
18
Dave Koslo
Career
Per 600 PA
12
12
Grant Jackson
Careerverified
Per 600 PAverified
718
1709.52
Dave Koslo
Career
Per 600 PA
350
367.78
Grant Jackson
Career
Per 600 PA
252
600
Dave Koslo
Careerverified
Per 600 PA
571
600
Grant Jackson
Career
Per 600 PAverified
236
561.9
Dave Koslo
Careerverified
Per 600 PA
516
542.21
Grant Jackson
Careerverified
Per 600 PAverified
0.136
0.136
Dave Koslo
Career
Per 600 PA
0.109
0.109
Grant Jackson
Careerverified
Per 600 PAverified
0.373
0.373
Dave Koslo
Career
Per 600 PA
0.363
0.363
Grant Jackson
Career
Per 600 PAverified
32
76.19
Dave Koslo
Careerverified
Per 600 PA
56
58.84
Grant Jackson
Career
Per 600 PAverified
27
64.29
Dave Koslo
Careerverified
Per 600 PA
41
43.08
Grant Jackson
Career
Per 600 PA
2
4.76
Dave Koslo
Careerverified
Per 600 PAverified
12
12.61
Grant Jackson
Careerverified
Per 600 PAverified
1
2.38
Dave Koslo
Career
Per 600 PA
0
0
Grant Jackson
Career
Per 600 PAverified
2
4.76
Dave Koslo
Careerverified
Per 600 PA
3
3.15
Grant Jackson
Career
Per 600 PA
5
11.9
Dave Koslo
Careerverified
Per 600 PAverified
15
15.76
Grant Jackson
Career
Per 600 PA
0.156
0.156
Dave Koslo
Careerverified
Per 600 PAverified
0.268
0.268
Grant Jackson
Careerverified
Per 600 PAverified
0.009
0.009
Dave Koslo
Career
Per 600 PA
0.006
0.006
Grant Jackson
Careerverified
Per 600 PAverified
0.063
0.063
Dave Koslo
Career
Per 600 PA
0.054
0.054
Grant Jackson
Career
Per 600 PAverified
7.48
17.81
Dave Koslo
Careerverified
Per 600 PA
14.88
15.63
Grant Jackson
Career
Per 600 PAverified
42
100
Dave Koslo
Careerverified
Per 600 PA
77
80.91
Grant Jackson
Career
Per 600 PA
40
95.24
Dave Koslo
Careerverified
Per 600 PAverified
93
97.72
Grant Jackson
Career
Per 600 PA
0.164
0.164
Dave Koslo
Careerverified
Per 600 PAverified
0.168
0.168
Grant Jackson
Careerverified
Per 600 PAverified
0.178
0.178
Dave Koslo
Career
Per 600 PA
0.149
0.149
Grant Jackson
Careerverified
Per 600 PAverified
0.342
0.342
Dave Koslo
Career
Per 600 PA
0.317
0.317
Grant Jackson
Careerverified
Per 600 PAverified
0.042
0.042
Dave Koslo
Career
Per 600 PA
0.041
0.041
Grant Jackson
Careerverified
Per 600 PAverified
0.118
0.118
Dave Koslo
Career
Per 600 PA
0.113
0.113
Grant Jackson
Career
Per 600 PA
0.242
0.242
Dave Koslo
Careerverified
Per 600 PAverified
0.247
0.247
Grant Jackson
Careerverified
Per 600 PAverified
0.208
0.208
Dave Koslo
Career
Per 600 PA
0.182
0.182
Grant Jackson
Career
Per 600 PAverified
20
47.62
Dave Koslo
Careerverified
Per 600 PA
31
32.57
Grant Jackson
Career
Per 600 PAverified
17
40.48
Dave Koslo
Careerverified
Per 600 PA
30
31.52
Grant Jackson
Career
Per 600 PAverified
35
83.33
Dave Koslo
Careerverified
Per 600 PA
58
60.95
Grant Jackson
Careerverified
Per 600 PAverified
1.36
3.23
Dave Koslo
Career
Per 600 PA
-1.47
-1.54
Grant Jackson
Career
Per 600 PAverified
1
2.38
Dave Koslo
Career
Per 600 PA
1
1.05
Grant Jackson
Career
Per 600 PA
7
16.67
Dave Koslo
Careerverified
Per 600 PAverified
36
37.83
Grant Jackson
Career
Per 600 PA
0
0
Dave Koslo
Career
Per 600 PA
0
0
Grant Jackson
Careerverified
Per 600 PAverified
90
214.29
Dave Koslo
Career
Per 600 PA
222
233.27
Grant Jackson
Careerverified
Per 600 PAverified
2.8
2.8
Dave Koslo
Career
Per 600 PA
2.57
2.57
Grant Jackson
Career
Per 600 PA
0.08
0.08
Dave Koslo
Careerverified
Per 600 PAverified
0.16
0.16
Grant Jackson
Career
Per 600 PAverified
8
19.05
Dave Koslo
Careerverified
Per 600 PA
18
18.91
Grant Jackson
Career
Per 600 PA
0
0
Dave Koslo
Career
Per 600 PA
0
0
Grant Jackson
Careerverified
Per 600 PA
3
7.14
Dave Koslo
Career
Per 600 PAverified
5
5.25
Grant Jackson
Career
Per 600 PA
0
0
Dave Koslo
Careerverified
Per 600 PAverified
1
1.05
Grant Jackson
Career
Per 600 PA
0
0
Dave Koslo
Careerverified
Per 600 PAverified
1
1.05
Grant Jackson
Career
Per 600 PA
0
0
Dave Koslo
Careerverified
Per 600 PAverified
2
2.1
Grant Jackson
Career
Per 600 PA
Dave Koslo
Careerverified
Per 600 PAverified
50
50