Dave Koslo

Pitcher · Career Stats, Bio & Records (1941-1955)

W–L 92–107
ERA 3.68
WHIP 1.34
SO 606
Pitcher PIV 4510.2
Position
Pitcher
Bats / Throws
L / L
Height / Weight
5'11" / 180 lb
Born
3/31/1920 in Menasha, WI, USA
Died
12/1/1975 in Menasha, WI, USA
MLB Debut
1941-09-12
Last Game
1955-04-14

Full name: George Bernard Koslo

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Career Pitching Statistics

W L G GS CG SHO SV IP H ER HR BB SO ERA Pitcher PIV
92 107 348 189 74 15 22 1591.3 1,597 651 121 538 606 3.68 4510.2

Career ERA 3.68 vs. league average 3.94 across their career seasons — 6.6% better than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Year Team Lg W L G GS CG SHO SV IP H ER BB SO ERA Lg ERA Pitcher PIV
1941 NY1 NL 1 2 4 3 2 0 0 23.7 17 5 10 12 1.90 3.94 (+52%) 522.1
1942 NY1 NL 3 6 19 11 3 1 0 78.0 79 44 32 42 5.08 3.57 (-42%) -716.6
1946 NY1 NL 14 19 40 35 17 3 1 265.3 251 107 101 121 3.63 3.59 (-1%) -111.7
1947 NY1 NL 15 10 39 31 10 3 0 217.3 223 106 82 86 4.39 3.97 (-11%) -2619.2
1948 NY1 NL 8 10 35 18 5 3 3 149.0 168 64 62 58 3.87 4.10 (+6%) 880.6
1949 NY1 NL 11 14 38 23 15 0 4 212.0 193 59 43 64 2.50 4.12 (+39%) 4462.4
1950 NY1 NL 13 15 40 22 7 1 3 186.7 190 81 68 56 3.91 4.36 (+10%) -243.0
1951 NY1 NL 10 9 39 16 5 2 3 149.7 153 55 45 54 3.31 4.04 (+18%) -835.8
1952 NY1 NL 10 7 41 17 8 2 5 166.3 154 59 47 67 3.19 3.70 (+14%) 1948.6
1953 NY1 NL 6 12 37 12 2 0 2 111.7 135 59 36 36 4.76 4.14 (-15%) 759.3
1954 BAL AL 0 1 3 1 0 0 0 14.3 20 5 3 3 3.14 3.90 (+19%) 137.7
1954 ML1 NL 1 1 12 0 0 0 1 17.3 13 6 9 7 3.12 3.90 (+20%) 325.9
1955 ML1 NL 0 1 1 0 0 0 0 0.0 1 1 0 0 0.00 — 0.0
Career · 13 seasons 92 107 348 189 74 15 22 1,591.1 1,597 651 538 606 3.68 — 4,510

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Career Batting Statistics

G AB R H 2B 3B HR RBI SB BB SO AVG OBP SLG OPS PIV
350 516 31 56 12 0 3 30 1 36 222 .109 .168 .149 .317 -3,446

Career AVG .109 vs. league average .260 across their career seasons — 58.3% below league average.

Career OBP .168 vs. league average .334 across their career seasons — 49.7% below league average.

Career SLG .149 vs. league average .379 across their career seasons — 60.6% below league average.

Career OPS .317 vs. league average .713 across their career seasons — 55.5% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Year Team Lg G AB R H 2B 3B HR RBI SB BB SO AVG Lg AVG Lg OBP Lg SLG Lg OPS PIV
1941 NY1 NL 4 9 0 1 0 0 0 0 0 0 7 .111 — — — — 0.0
1942 NY1 NL 19 25 4 3 2 0 0 1 0 2 10 .120 — — — — 0.0
1946 NY1 NL 41 88 7 11 2 0 0 6 0 4 39 .125 .256 (-51%) .328 (-50%) .358 (-59%) .687 (-55%) -746.5
1947 NY1 NL 39 78 6 10 1 0 0 2 0 8 37 .128 .262 (-51%) .336 (-38%) .376 (-63%) .712 (-51%) -623.0
1948 NY1 NL 35 44 2 5 2 0 0 4 0 1 16 .114 — — — — 0.0
1949 NY1 NL 39 69 4 10 2 0 2 7 0 5 27 .145 .262 (-45%) .343 (-41%) .384 (-32%) .727 (-36%) -424.3
1950 NY1 NL 40 65 4 8 1 0 1 6 0 6 24 .123 .265 (-54%) .346 (-43%) .401 (-54%) .747 (-49%) -533.7
1951 NY1 NL 39 50 1 5 1 0 0 1 1 6 18 .100 .260 (-62%) .336 (-42%) .385 (-69%) .721 (-56%) -448.6
1952 NY1 NL 41 54 3 2 1 0 0 3 0 3 31 .037 .252 (-85%) .326 (-73%) .369 (-85%) .696 (-79%) -670.1
1953 NY1 NL 37 30 0 1 0 0 0 0 0 1 11 .033 — — — — 0.0
1954 BAL AL 3 3 0 0 0 0 0 0 0 0 2 .000 — — — — 0.0
1954 ML1 NL 12 1 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
1955 ML1 NL 1 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
Career · 13 seasons 350 516 31 56 12 0 3 30 1 36 222 .109 — — — — -3,446

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Postseason Statistics

Playoff Career Batting

G AB R H 2B 3B HR RBI BB SO AVG
2 5 0 0 0 0 0 0 0 2 .000

Playoff Batting by Year

Year Round Team G AB R H 2B 3B HR RBI BB SO AVG
1951 WS NY1 2 5 0 0 0 0 0 0 0 2 .000

Playoff Career Pitching

W L G GS SV IP H ER BB SO ERA
1 1 2 2 0 15.0 12 5 7 6 3.00

Playoff Pitching by Year

Year Round Team W L G GS SV IP H ER BB SO ERA
1951 WS NY1 1 1 2 2 0 15.0 12 5 7 6 3.00

Game Log & Splits

View full game log (698 games) →

Per-game data from Retrosheet (regular season, through 2025).

Batting — Home / Away

SplitGABRHHRRBIAVG
Home1682341318211.077
Away1822821838118.135

Pitching — Home / Away

SplitGIPHERBBSOERA
Home168781.07513232532963.72
Away180810.08463232853173.59

Last 10 Games — Batting

DateTmOppResABRH2B3BHRRBIBBSO
1955-04-14 ATLSTLL 000000000
1954-09-19 ATLSTLL 100000000
1954-09-17 ATLSTLW 000000000
1954-09-16 ATLNY1L 000000000
1954-09-11 ATLBROL 000000000
1954-09-05 ATLCINW 000000000
1954-09-04 ATLCINW 000000000
1954-09-03 ATLCINW 000000000
1954-08-29 ATLBROL 000000000
1954-08-29 ATLBROL 000000000

Last 10 Games — Pitching

DateTmOppDecIPHRERBBSOHR
1955-04-14 ATLSTL L 0.0111001
1954-09-19 ATLSTL L 2.2333300
1954-09-17 ATLSTL — 0.1000000
1954-09-16 ATLNY1 — 0.2200000
1954-09-11 ATLBRO — 2.0000110
1954-09-05 ATLCIN SV 1.2100000
1954-09-04 ATLCIN W 2.2200110
1954-09-03 ATLCIN — 1.1000000
1954-08-29 ATLBRO — 2.0433220
1954-08-29 ATLBRO — 0.2000010

Fielding Statistics

Career Fielding Totals by Position

Position G GS PO A E DP
P 348 1 75 307 14 23

Season-by-Season Fielding

Year Team Pos G GS PO A E DP
1941 NY1 P 4 0 0 3 1 0
1942 NY1 P 19 0 1 13 1 0
1946 NY1 P 40 0 10 61 3 1
1947 NY1 P 39 0 13 36 2 2
1948 NY1 P 35 0 8 24 0 1
1949 NY1 P 38 0 7 39 0 4
1950 NY1 P 40 0 5 37 2 3
1951 NY1 P 39 0 7 38 0 2
1952 NY1 P 41 0 16 33 4 7
1953 NY1 P 37 0 7 22 1 3
1954 BAL P 3 1 1 1 0 0
1954 ML1 P 12 0 0 0 0 0
1955 ML1 P 1 0 0 0 0 0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Position Games
Pitcher 348

Most Similar Players

Career comps based on counting + rate stats and primary position. Score is relative — closest peer anchors at ~98%.

Career Spans

Dave Koslo (highlighted) compared to peers across the same era.

  1. 98
    Johnny Morrison
    103-80, 3.65 ERA
  2. 96
    Al Smith
    99-101, 3.72 ERA
  3. 92
    Nels Potter
    92-97, 3.99 ERA
  4. 85
    Jack Scott
    103-109, 3.85 ERA
  5. 84
    Roger Craig
    74-98, 3.83 ERA
  6. 76
    Art Houtteman
    87-91, 4.14 ERA

Frequently Asked Questions about Dave Koslo

What years did Dave Koslo play?
Dave Koslo played in Major League Baseball from 1941 to 1955.
Was Dave Koslo a pitcher?
Yes. Dave Koslo pitched in the major leagues, recording 92 wins and 606 strikeouts.
How many home runs did Dave Koslo hit?
Dave Koslo hit 3 career home runs with 56 hits.