Bill Hallahan had a record of 3-1 with an ERA of 1.36, 27 strikeouts and 1 save in 7 appearances in the World Series in his career.
| NAME | DATE | SEASON | SERIES | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | B. Hallahan | 10/6/1926 | 1926 | World Series |  SLN | vs |  NYY | 0 | 4.50 | 1 | 0 | 0 | 0 | 2.0 | 2 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 11 | 0 | |
| 2 | | B. Hallahan | 10/4/1930 | 1930 | World Series | SLN | vs |  PHA | W | 1 | 0.00 | 6 | 1 | 1 | 0 | 9.0 | 7 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 38 | 0 |
| 3 | | B. Hallahan | 10/8/1930 | 1930 | World Series | SLN | @ | PHA | L | 1 | 9.00 | 2 | 0 | 0 | 0 | 2.0 | 2 | 2 | 2 | 0 | 3 | 1 | 0 | 0 | 12 | 0 |
| 4 | | B. Hallahan | 10/2/1931 | 1931 | World Series | SLN | vs | PHA | W | 1 | 0.00 | 8 | 1 | 1 | 0 | 9.0 | 3 | 0 | 0 | 0 | 7 | 0 | 0 | 1 | 37 | 1 |
| 5 | | B. Hallahan | 10/7/1931 | 1931 | World Series | SLN | @ | PHA | W | 1 | 1.00 | 4 | 1 | 0 | 0 | 9.0 | 9 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 36 | 0 |
| 6 | | B. Hallahan | 10/10/1931 | 1931 | World Series | SLN | vs | PHA | 0 | 0.00 | 0 | 0 | 0 | 1 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | |
| 7 | | B. Hallahan | 10/4/1934 | 1934 | World Series | SLN | @ |  DET | 1 | 2.16 | 6 | 0 | 0 | 0 | 8.1 | 6 | 2 | 2 | 0 | 4 | 0 | 0 | 0 | 37 | 0 | |
| Total | 5 | 1.36 | 27 | 3 | 2 | 1 | 39.2 | 29 | 6 | 6 | 0 | 23 | 1 | 1 | 1 | 172 | 1 |
Some of the information used here was obtained free of charge from Retrosheet.
Brewers 
Cubs 
Reds 
Pirates 
Phillies 
Braves 
Dodgers 
Padres 
Orioles 
Guardians 
Royals 
Astros 
Mariners 
WSH 
TOR 
MIN 
LAA 
CWS 
