Since 1901, 13 teams are tied for the fewest games pitched with exactly 0 runs allowed in a season, with 1 game. The first three are the Baltimore Orioles this season, in 2020 and in 1996, the Seattle Mariners this season and in 1977 and the Colorado Rockies in 2024, in 2020 and in 1995.
| TEAM | G | R | SEASON | W% | W | L | ERA | SO | SHO | SV | IP | H | ER | HR | BB | HBP | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Orioles | 1 | 0 | 2025 | 1.000 | 1 | 0 | 0.00 | 4 | 0 | 1 | 9.0 | 4 | 0 | 0 | 1 | 0 | 0 | 32 | 1 | 4.00 | 1.00 | 4.00 | 0.00 | 12.5 | 3.1 | 0.56 | .148 | 0.00 | 4.00 |
| 2 |  | Mariners | 1 | 0 | 2025 | 1.000 | 1 | 0 | 0.00 | 7 | 0 | 0 | 9.0 | 4 | 0 | 0 | 2 | 0 | 0 | 33 | 0 | 7.00 | 2.00 | 3.50 | 0.00 | 21.2 | 6.1 | 0.67 | .167 | 0.00 | 4.00 |
| 3 |  | Rockies | 1 | 0 | 2024 | 1.000 | 1 | 0 | 0.00 | 9 | 0 | 0 | 9.0 | 4 | 0 | 0 | 4 | 0 | 0 | 34 | 0 | 9.00 | 4.00 | 2.25 | 0.00 | 26.5 | 11.8 | 0.89 | .190 | 0.00 | 4.00 |
| 4 |  | Tigers | 1 | 0 | 2020 | 1.000 | 1 | 0 | 0.00 | 9 | 0 | 0 | 9.0 | 5 | 0 | 0 | 5 | 0 | 0 | 37 | 0 | 9.00 | 5.00 | 1.80 | 0.00 | 24.3 | 13.5 | 1.11 | .217 | 0.00 | 5.00 |
| 5 |  | Blue Jays | 1 | 0 | 2020 | 1.000 | 1 | 0 | 0.00 | 7 | 0 | 0 | 9.0 | 5 | 0 | 0 | 3 | 0 | 0 | 35 | 0 | 7.00 | 3.00 | 2.33 | 0.00 | 20.0 | 8.6 | 0.89 | .200 | 0.00 | 5.00 |
| 6 | | Rockies | 1 | 0 | 2020 | 1.000 | 1 | 0 | 0.00 | 6 | 0 | 0 | 9.0 | 1 | 0 | 0 | 2 | 1 | 0 | 30 | 0 | 6.00 | 2.00 | 3.00 | 0.00 | 20.0 | 6.7 | 0.33 | .048 | 0.00 | 1.00 |
| 7 | | Orioles | 1 | 0 | 2020 | 1.000 | 1 | 0 | 0.00 | 3 | 0 | 0 | 9.0 | 4 | 0 | 0 | 1 | 1 | 0 | 32 | 0 | 3.00 | 1.00 | 3.00 | 0.00 | 9.4 | 3.1 | 0.56 | .148 | 0.00 | 4.00 |
| 8 |  | Mets | 1 | 0 | 2020 | 1.000 | 1 | 0 | 0.00 | 15 | 0 | 1 | 9.0 | 3 | 0 | 0 | 2 | 0 | 0 | 32 | 0 | 15.00 | 2.00 | 7.50 | 0.00 | 46.9 | 6.3 | 0.56 | .200 | 0.00 | 3.00 |
| 9 |  | Reds | 1 | 0 | 2005 | 1.000 | 1 | 0 | 0.00 | 11 | 0 | 0 | 9.0 | 5 | 0 | 0 | 1 | 1 | 0 | 33 | 1 | 11.00 | 1.00 | 11.00 | 0.00 | 33.3 | 3.0 | 0.67 | .250 | 0.00 | 5.00 |
| 10 |  | Angels | 1 | 0 | 2001 | 1.000 | 1 | 0 | 0.00 | 6 | 0 | 1 | 9.0 | 4 | 0 | 0 | 2 | 1 | 0 | 34 | 0 | 6.00 | 2.00 | 3.00 | 0.00 | 17.6 | 5.9 | 0.67 | .160 | 0.00 | 4.00 |
| 11 |  | Royals | 1 | 0 | 2001 | 1.000 | 1 | 0 | 0.00 | 5 | 0 | 0 | 9.0 | 6 | 0 | 0 | 2 | 0 | 0 | 33 | 1 | 5.00 | 2.00 | 2.50 | 0.00 | 15.2 | 6.1 | 0.89 | .231 | 0.00 | 6.00 |
| 12 |  | Athletics | 1 | 0 | 1997 | 1.000 | 1 | 0 | 0.00 | 1 | 0 | 1 | 9.0 | 7 | 0 | 0 | 2 | 0 | 1 | 35 | 0 | 1.00 | 2.00 | 0.50 | 0.00 | 2.9 | 5.7 | 1.00 | .219 | 0.00 | 7.00 |
| 13 | | Orioles | 1 | 0 | 1996 | 1.000 | 1 | 0 | 0.00 | 11 | 1 | 0 | 9.0 | 6 | 0 | 0 | 1 | 0 | 0 | 33 | 0 | 11.00 | 1.00 | 11.00 | 0.00 | 33.3 | 3.0 | 0.78 | .286 | 0.00 | 6.00 |
| 14 | | Rockies | 1 | 0 | 1995 | 1.000 | 1 | 0 | 0.00 | 6 | 0 | 0 | 9.0 | 7 | 0 | 0 | 3 | 0 | 0 | 37 | 0 | 6.00 | 3.00 | 2.00 | 0.00 | 16.2 | 8.1 | 1.11 | .250 | 0.00 | 7.00 |
| 15 | | Tigers | 1 | 0 | 1994 | 1.000 | 1 | 0 | 0.00 | 8 | 1 | 0 | 9.0 | 3 | 0 | 0 | 1 | 0 | 0 | 30 | 0 | 8.00 | 1.00 | 8.00 | 0.00 | 26.7 | 3.3 | 0.44 | .143 | 0.00 | 3.00 |
| 16 |  | Mariners | 1 | 0 | 1977 | 1.000 | 1 | 0 | 0.00 | 8 | 1 | 0 | 9.0 | 6 | 0 | 0 | 1 | 0 | 0 | 34 | 0 | 8.00 | 1.00 | 8.00 | 0.00 | 23.5 | 2.9 | 0.78 | .240 | 0.00 | 6.00 |
| 17 |  | Senators | 1 | 0 | 1956 | 1.000 | 1 | 0 | 0.00 | 2 | 1 | 0 | 9.0 | 4 | 0 | 0 | 1 | 0 | 1 | 33 | 0 | 2.00 | 1.00 | 2.00 | 0.00 | 6.1 | 3.0 | 0.56 | .133 | 0.00 | 4.00 |
| 18 |  | Braves | 1 | 0 | 1928 | 1.000 | 1 | 0 | 0.00 | 1 | 1 | 0 | 9.0 | 2 | 0 | 0 | 5 | 0 | 35 | 0 | 1.00 | 5.00 | 0.20 | 0.00 | 2.9 | 14.3 | 0.78 | .069 | 0.00 | 2.00 | |
| 19 |  | White Sox | 1 | 0 | 1924 | 1.000 | 1 | 0 | 0.00 | 1 | 1 | 0 | 9.0 | 5 | 0 | 0 | 1 | 1 | 33 | 0 | 1.00 | 1.00 | 1.00 | 0.00 | 3.0 | 3.0 | 0.67 | .167 | 0.00 | 5.00 | |
| 20 |  | Athletics | 1 | 0 | 1919 | 1.000 | 1 | 0 | 0.00 | 2 | 1 | 0 | 9.0 | 4 | 0 | 0 | 5 | 0 | 32 | 1 | 2.00 | 5.00 | 0.40 | 0.00 | 6.3 | 15.6 | 1.00 | .160 | 0.00 | 4.00 | |
| 21 | | Blue Jays | 2 | 0 | 2025 | 1.000 | 2 | 0 | 0.00 | 18 | 0 | 1 | 18.0 | 10 | 0 | 0 | 1 | 0 | 0 | 65 | 0 | 9.00 | 0.50 | 18.00 | 0.00 | 27.7 | 1.5 | 0.61 | .217 | 0.00 | 5.00 |
| 22 |  | Nationals | 2 | 0 | 2025 | 1.000 | 2 | 0 | 0.00 | 16 | 0 | 1 | 18.0 | 5 | 0 | 0 | 5 | 0 | 0 | 64 | 0 | 8.00 | 2.50 | 3.20 | 0.00 | 25.0 | 7.8 | 0.56 | .116 | 0.00 | 2.50 |
| 23 |  | Marlins | 2 | 0 | 2025 | 1.000 | 2 | 0 | 0.00 | 16 | 0 | 0 | 18.0 | 9 | 0 | 0 | 4 | 0 | 0 | 64 | 0 | 8.00 | 2.00 | 4.00 | 0.00 | 25.0 | 6.3 | 0.72 | .205 | 0.00 | 4.50 |
| 24 |  | Braves | 2 | 0 | 2025 | 1.000 | 2 | 0 | 0.00 | 18 | 0 | 0 | 18.0 | 5 | 0 | 0 | 5 | 0 | 0 | 63 | 0 | 9.00 | 2.50 | 3.60 | 0.00 | 28.6 | 7.9 | 0.56 | .125 | 0.00 | 2.50 |
| 25 |  | Angels | 2 | 0 | 2025 | 1.000 | 2 | 0 | 0.00 | 15 | 0 | 2 | 18.0 | 6 | 0 | 0 | 7 | 0 | 0 | 65 | 1 | 7.50 | 3.50 | 2.14 | 0.00 | 23.1 | 10.8 | 0.72 | .140 | 0.00 | 3.00 |
StatMuse has team, game-level data for runs allowed going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
Yankees 
Red Sox 
Blue Jays 
Rays 
Orioles 
STL 
Phillies 
Mets 
Cubs 
Dodgers 
Giants 
Tigers 
Guardians 
Mariners 
Astros 
ATL 
PIT 
TEX 
WSH 
MIL 
KCR 
MIN 
AZ 
