His pinch-hit grand slam capped a game where the Mariners blew a 5-1 lead, then rallied from an 8-6 deficit with five more runs in the eighth.
"It's huge," Gutierrez said of the chance to help a Mariners club that has given him yet another chance this season. "We need to win. Everybody here is doing their jobs. For me to come back to this team and have an opportunity to do something, it's huge for me to contribute any time I've got the opportunity."
Gutierrez's opposite-field blow off Tigers reliever Neftali Feliz was just the second pinch-hit grand slam in Mariners history, joining Ben Broussard's 2007 blast off Scot Shields of the Angels in 2007.