Bill Koski

Pitcher · Career Stats, Bio & Records (1951)

Bill Koski was a pitcher who played in Major League Baseball in 1951 for the Pittsburgh Pirates. Across 13 career appearances, he went 0-1 with a 6.67 ERA and 6 strikeouts.

W (Wins):
Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
ERA (Earned Run Average):
Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
SO (Strikeouts):
For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
WHIP (Walks and Hits per Inning Pitched):
Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.

Data updated

W–L 0–1
ERA 6.67
WHIP 2.00
SO 6
Pitcher PIV -1396.6
Position
Pitcher
Bats / Throws
R / R
Height / Weight
6'4" / 185 lb
Born
2/6/1932 in Madera, CA, USA
Died
7/9/2014 in Modesto, CA, USA
MLB Debut
1951-04-28
Last Game
1951-09-22

Full name: William John Koski

📊 Compare This Player 📈 View Career Timeline

Career Pitching Statistics

Bill Koski — Career Pitching Statistics
W L G GS CG SHO SV IP H ER HR BB SO ERA Pitcher PIV
0 1 13 1 0 0 0 27.0 26 20 2 28 6 6.67 -1396.6

Career ERA 6.67 vs. league average 4.04 across their career seasons — 65.1% worse than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Bill Koski — Season-by-Season Pitching
Year Team Lg W L G GS CG SHO SV IP H ER BB SO ERA Lg ERA Pitcher PIV
1951 PIT NL 0 1 13 1 0 0 0 27.0 26 20 28 6 6.67 4.04 (-65%) -1396.6
Career · 1 season 0 1 13 1 0 0 0 27.0 26 20 28 6 6.67 — -1,397

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

Bill Koski — Career Batting Statistics
G AB R H 2B 3B HR RBI SB BB SO AVG OBP SLG OPS PIV
13 4 0 0 0 0 0 0 0 0 1 .000 .000 .000 .000 0

Career AVG .000 vs. league average .261 across their career seasons — 100.0% below league average.

Career OBP .000 vs. league average .336 across their career seasons — 100.0% below league average.

Career SLG .000 vs. league average .386 across their career seasons — 100.0% below league average.

Career OPS .000 vs. league average .722 across their career seasons — 100.0% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Bill Koski — 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
1951 PIT NL 13 4 0 0 0 0 0 0 0 0 1 .000 — — — — 0.0
Career · 1 season 13 4 0 0 0 0 0 0 0 0 1 .000 — — — — 0

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.

Game Log & Splits

View full game log (26 games) →

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

Batting — Home / Away

Bill Koski — Batting — Home / Away
SplitGABRHHRRBIAVG
Home830000.000
Away520000.000

Pitching — Home / Away

Bill Koski — Pitching — Home / Away
SplitGIPHERBBSOERA
Home817.216111515.60
Away59.11091358.68

Last 10 Games — Batting

Bill Koski — Last 10 Games — Batting
DateTmOppResABRH2B3BHRRBIBBSO
1951-09-22 PITCINL 000000000
1951-09-07 PITSTLL 100000000
1951-06-03 PITPHIL 000000000
1951-06-01 PITNY1L 000000000
1951-05-23 PITBROL 000000000
1951-05-22 PITBROL 000000000
1951-05-20 PITPHIL 000000000
1951-05-17 PITNY1W 000000000
1951-05-12 PITCHCL 200000001
1951-05-11 PITCHCL 000000000

Last 10 Games — Pitching

Bill Koski — Last 10 Games — Pitching
DateTmOppDecIPHRERBBSOHR
1951-09-22 PITCIN — 1.0000110
1951-09-07 PITSTL — 2.1332400
1951-06-03 PITPHI — 1.0433301
1951-06-01 PITNY1 — 2.0222211
1951-05-23 PITBRO — 1.0322000
1951-05-22 PITBRO — 1.0000000
1951-05-20 PITPHI — 0.0133300
1951-05-17 PITNY1 — 2.1211000
1951-05-12 PITCHC — 7.0320600
1951-05-11 PITCHC — 1.0433100

Fielding Statistics

Career Fielding Totals by Position

Bill Koski — Career Fielding Totals by Position
Position G GS PO A E DP
P 13 0 0 2 0 0

Season-by-Season Fielding

Bill Koski — Season-by-Season Fielding
Year Team Pos G GS PO A E DP
1951 PIT P 13 0 0 2 0 0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Bill Koski — Career Games by Position
Position Games
Pitcher 13

Bill Koski: the record in brief

Between the debut on April 28, 1951 and the final game on September 22, 1951, Bill Koski built the record summarized on this page. The team column never changes: it is the Pittsburgh Pirates in 1951. At 185 pounds on a 6-foot-4 frame, Koski is listed as a pitcher. The bio says Koski both batted and threw right-handed. Koski was born on February 6, 1932, in Madera, CA, USA. The bio records the death on July 9, 2014, in Modesto, CA, USA. Bill Koski was the playing name; the full given name is William John.

Across 13 games (1 starts), Koski recorded 0 wins against 1 loss with a 6.67 ERA. Koski had 6 strikeouts. The league ERA over Koski's seasons was 4.04, so the 6.67 figure ran 65.1% worse than average. All of that pitching came in 1951, with 13 games and 6 strikeouts.

The game-log section draws on 26 games of Retrosheet box scores for Koski.

The position breakdown shows 13 games, all at pitcher. On the mound, the fielding record shows 0 errors alongside 0 putouts and 2 assists.

Frequently Asked Questions about Bill Koski

Was Bill Koski a pitcher?
Yes. Bill Koski pitched in the major leagues, recording 0 wins and 6 strikeouts.
How many home runs did Bill Koski hit?
Bill Koski hit 0 career home runs.
What was Bill Koski's career batting average?
Bill Koski batted .000 over his career, with 0 hits in 4 at bats.
What was Bill Koski's career ERA?
Bill Koski finished with a 6.67 career ERA, going 0-1 with 6 strikeouts.
How many strikeouts did Bill Koski have?
Bill Koski recorded 6 career strikeouts.
Is Bill Koski in the Hall of Fame?
No. Bill Koski has not been inducted into the National Baseball Hall of Fame.