Dave Koslo, baseball player, 1941-1955

Dave Koslo

Born: 3/31/1920 in Menasha, WI, USA

Died: 12/1/1975 in Menasha, WI, USA

MLB Debut: 1941-09-12 | Final Game: 1955-04-14

Bats: L | Throws: L | Height: 5'11" | Weight: 180 lbs

Full name: George Bernard Koslo

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Biography

Dave Koslo was a professional baseball pitcher who played in Major League Baseball from 1941 until 1955. Born in 1920, he made his debut during a time when the sport was heavily influenced by the impending World War II, which significantly affected player availability and team rosters. Koslo established himself as a reliable arm in the pitching rotation, finishing his career with a record of 92 wins and 107 losses. His earned run average of 3.68 reflects his ability to keep games competitive, while his 606 strikeouts demonstrate his capability to overpower hitters during a period when pitching was both an art and a science. Throughout his career, Koslo was known for his durability and versatility on the mound. He recorded a total of 22 saves, showcasing his effectiveness not only as a starter but also in relief roles. His contributions were particularly significant within the context of the post-war baseball landscape, where the return of veterans added depth to rosters and heightened competition. Koslo's career encapsulated the transition of baseball in the early 1950s, as the game began to evolve with new strategies and player dynamics, leaving a lasting legacy in the annals of baseball history.

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 1597 651 121 538 606 3.68 0

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

Season-by-Season Pitching

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%) -728.7
1946 NY1 NL 14 19 40 35 17 3 1 265.3 251 107 101 121 3.63 3.59 (-1%) -118.1
1947 NY1 NL 15 10 39 31 10 3 0 217.3 223 106 82 86 4.39 3.97 (-11%) -2742.5
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%) -252.9
1951 NY1 NL 10 9 39 16 5 2 3 149.7 153 55 45 54 3.31 4.04 (+18%) -862.9
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 ATL NL 1 1 12 0 0 0 1 17.3 13 6 9 7 3.12 3.90 (+20%) -
1955 ATL NL 0 1 1 0 0 0 0 0.0 1 1 0 0 0.00 — -

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 0.109 0.168 0.149 0.317 -3714.6

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 0.317 vs. league average 0.713 across their career seasons — 55.5% below league average.

Season-by-Season Batting

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 0.111 — — — — 0.0
1942 NY1 NL 19 25 4 3 2 0 0 1 0 2 10 0.120 — — — — 0.0
1946 NY1 NL 41 88 7 11 2 0 0 6 0 4 39 0.125 .256 (-51%) .328 (-50%) .358 (-59%) .687 (-55%) -806.1
1947 NY1 NL 39 78 6 10 1 0 0 2 0 8 37 0.128 .262 (-51%) .336 (-38%) .376 (-63%) .712 (-51%) -670.4
1948 NY1 NL 35 44 2 5 2 0 0 4 0 1 16 0.114 — — — — 0.0
1949 NY1 NL 39 69 4 10 2 0 2 7 0 5 27 0.145 .262 (-45%) .343 (-41%) .384 (-32%) .727 (-36%) -456.5
1950 NY1 NL 40 65 4 8 1 0 1 6 0 6 24 0.123 .265 (-54%) .346 (-43%) .401 (-54%) .747 (-49%) -575.3
1951 NY1 NL 39 50 1 5 1 0 0 1 1 6 18 0.100 .260 (-62%) .336 (-42%) .385 (-69%) .721 (-56%) -482.7
1952 NY1 NL 41 54 3 2 1 0 0 3 0 3 31 0.037 .252 (-85%) .326 (-73%) .369 (-85%) .696 (-79%) -723.6
1953 NY1 NL 37 30 0 1 0 0 0 0 0 1 11 0.033 — — — — 0.0
1954 BAL AL 3 3 0 0 0 0 0 0 0 0 2 0.000 — — — — 0.0
1954 ATL NL 12 1 0 0 0 0 0 0 0 0 0 0.000 — — — — 0.0
1955 ATL NL 1 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0

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 0.000

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 0.000

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

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 Games
Pitcher 348