On August 4, 2008 — The Mariners stun the Twins with a 10-run seventh inning, coming back from a 6-0 deficit in an eventual 11-6 victory at Safeco Field. With six runs driven in, Raul Ibanez, who hits a grand slam and a two-run single in the frame, establishes a club record for RBIs in one inning, one more than Ken Griffey Jr.’s mark set in 1999.

Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game