On August 16, 2008 — For the first time in Arizona Diamondbacks history, the team gets two grand slams in a game. Both Miguel Montero and Chris Young hit the first grand slams of their careers in the 11 – 5 win over the Astros.
Source:
Baseball Reference August 16
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game