18 teams are tied for the most grand slams in a game in the 11th inning, with 1 grand slam. The first three are the Boston Red Sox on August 23, 2021, the Toronto Blue Jays on May 3, 2018 and the Washington Nationals 4 times.
Interpreted as:
team most grand slam in a regular-season game in the 11th inning| TEAM | GRANDSLAM | DATE | TM | OPP | AB | H | 2B | 3B | HR | RBI | BB | HBP | SO | PA | TB | XBH | SH | SF | IBB | AVG | OBP | SLG | OPS | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Red Sox | 1 | 8/23/2021 |  BOS | vs |  TEX | 1 | 1 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 3 | 4 | 1 | 1 | 0 | 1 | 1.000 | 1.000 | 4.000 | 5.000 |
| 2 |  | Blue Jays | 1 | 5/3/2018 |  TOR | @ |  CLE | 5 | 2 | 1 | 0 | 1 | 4 | 2 | 0 | 1 | 7 | 6 | 2 | 0 | 0 | 0 | .400 | .571 | 1.200 | 1.771 |
| 3 |  | Nationals | 1 | 8/13/2017 |  WSH | vs |  SFG | 3 | 3 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 4 | 6 | 1 | 0 | 0 | 1 | 1.000 | 1.000 | 2.000 | 3.000 |
| 4 |  | Indians | 1 | 7/25/2017 | CLE | vs |  LAA | 1 | 1 | 0 | 0 | 1 | 4 | 3 | 0 | 0 | 4 | 4 | 1 | 0 | 0 | 1 | 1.000 | 1.000 | 4.000 | 5.000 |
| 5 |  | Cardinals | 1 | 4/27/2017 |  STL | vs | TOR | 3 | 2 | 0 | 1 | 1 | 4 | 2 | 0 | 0 | 5 | 7 | 2 | 0 | 0 | 2 | .667 | .800 | 2.333 | 3.133 |
| 6 |  | Giants | 1 | 4/23/2014 | SFG | @ |  COL | 4 | 2 | 0 | 0 | 1 | 4 | 2 | 0 | 0 | 7 | 5 | 1 | 1 | 0 | 1 | .500 | .667 | 1.250 | 1.917 |
| 7 | | Nationals | 1 | 6/19/2013 | WSH | @ |  PHI | 6 | 3 | 1 | 0 | 1 | 4 | 2 | 0 | 1 | 8 | 7 | 2 | 0 | 0 | 1 | .500 | .625 | 1.167 | 1.792 |
| 8 |  | Phillies | 1 | 6/4/2013 | PHI | vs |  MIA | 3 | 1 | 0 | 0 | 1 | 4 | 2 | 0 | 0 | 6 | 4 | 1 | 1 | 0 | 1 | .333 | .600 | 1.333 | 1.933 |
| 9 | | Nationals | 1 | 6/5/2011 | WSH | @ |  ARI | 5 | 3 | 0 | 0 | 1 | 5 | 2 | 1 | 1 | 9 | 6 | 1 | 1 | 0 | 0 | .600 | .750 | 1.200 | 1.950 |
| 10 |  | Padres | 1 | 6/2/2010 |  SDP | vs |  NYM | 4 | 3 | 1 | 0 | 1 | 4 | 0 | 1 | 0 | 5 | 7 | 2 | 0 | 0 | 0 | .750 | .800 | 1.750 | 2.550 |
| 11 |  | Astros | 1 | 6/28/2007 |  HOU | vs | COL | 5 | 3 | 1 | 0 | 1 | 4 | 0 | 1 | 1 | 6 | 7 | 2 | 0 | 0 | 0 | .600 | .667 | 1.400 | 2.067 |
| 12 |  | Angels | 1 | 6/28/2005 | LAA | @ | TEX | 6 | 3 | 1 | 0 | 1 | 4 | 2 | 0 | 1 | 8 | 7 | 2 | 0 | 0 | 1 | .500 | .625 | 1.167 | 1.792 |
| 13 |  | Mariners | 1 | 7/19/2004 |  SEA | vs | BOS | 2 | 2 | 0 | 0 | 1 | 4 | 2 | 0 | 0 | 5 | 5 | 1 | 1 | 0 | 1 | 1.000 | 1.000 | 2.500 | 3.500 |
| 14 | | Giants | 1 | 5/22/2004 | SFG | @ |  MON | 6 | 2 | 0 | 0 | 1 | 5 | 2 | 0 | 0 | 9 | 5 | 1 | 1 | 0 | 0 | .333 | .500 | .833 | 1.333 |
| 15 |  | Rangers | 1 | 7/31/2003 | TEX | vs | BOS | 4 | 2 | 0 | 0 | 1 | 4 | 2 | 0 | 1 | 6 | 5 | 1 | 0 | 0 | 0 | .500 | .667 | 1.250 | 1.917 |
| 16 |  | Reds | 1 | 5/26/2003 |  CIN | @ |  ATL | 5 | 2 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 7 | 5 | 1 | 1 | 0 | 1 | .400 | .500 | 1.000 | 1.500 |
| 17 | | Mariners | 1 | 9/8/2002 | SEA | @ |  KCR | 8 | 5 | 1 | 0 | 3 | 8 | 3 | 1 | 3 | 12 | 15 | 4 | 0 | 0 | 1 | .625 | .750 | 1.875 | 2.625 |
| 18 |  | Mets | 1 | 3/30/2000 | NYM | @ |  CHC | 6 | 3 | 1 | 0 | 1 | 4 | 2 | 0 | 0 | 8 | 7 | 2 | 0 | 0 | 0 | .500 | .625 | 1.167 | 1.792 |
| 19 |  | Brewers | 1 | 4/2/1998 |  MIL | @ | ATL | 6 | 2 | 0 | 0 | 1 | 4 | 1 | 0 | 2 | 7 | 5 | 1 | 0 | 0 | 0 | .333 | .429 | .833 | 1.262 |
| 20 |  | Angels | 1 | 4/4/1997 |  ANA | vs | CLE | 3 | 3 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 4 | 6 | 1 | 0 | 0 | 0 | 1.000 | 1.000 | 2.000 | 3.000 |
| 21 |  | Cubs | 1 | 8/30/1993 | CHC | vs | PHI | 4 | 2 | 0 | 0 | 1 | 4 | 2 | 0 | 2 | 6 | 5 | 1 | 0 | 0 | 0 | .500 | .667 | 1.250 | 1.917 |
| 22 |  | Astros | 1 | 7/27/1992 |  HOU | @ | ATL | 6 | 3 | 0 | 0 | 1 | 4 | 1 | 0 | 2 | 7 | 6 | 1 | 0 | 0 | 0 | .500 | .571 | 1.000 | 1.571 |
| 23 |  | Royals | 1 | 8/14/1991 | KCR | @ |  NYY | 6 | 3 | 0 | 0 | 1 | 4 | 1 | 0 | 0 | 7 | 6 | 1 | 0 | 0 | 1 | .500 | .571 | 1.000 | 1.571 |
| 24 |  | Phillies | 1 | 8/6/1991 |  PHI | vs | CHC | 3 | 2 | 0 | 0 | 1 | 4 | 2 | 0 | 1 | 5 | 5 | 1 | 0 | 0 | 1 | .667 | .800 | 1.667 | 2.467 |
| 25 | | Cubs | 1 | 4/21/1991 | CHC | @ |  PIT | 6 | 3 | 0 | 0 | 1 | 5 | 2 | 0 | 0 | 8 | 6 | 1 | 0 | 0 | 0 | .500 | .625 | 1.000 | 1.625 |
Results may be incomplete. StatMuse has complete event-level data for grand slams going back to the 1974 season.
Some of the information used here was obtained free of charge from Retrosheet.
Rays 
Orioles 
Tigers 
Twins 
Astros 
Dodgers 
Padres 
MIA 
CLE 
