Record would not be so grand
The Mets have allowed 10 grand slam home runs this season. That is two short of the National league record, held by the Montreal Expos (now Washington Nationals). The major league record of 14 was set by the Detroit Tigers in 1996.
By the way, the Mets have not hit any grand slams this season.

MLB's first-half attendance is up, but Mets' and Yankees' are not
3m read

Albanese: MLB put players at risk by playing Mets-Phillies game
4m read

Mets-Phillies game moved up due to air quality concerns from wildfire smoke
1m read

MLB's new ABS challenge system and how the Yanks, Mets are faring with it
4m read

5 questions facing the Mets in the second half of the season
4m read