Seattle has lost four of five and went 4-6 on its road trip that included stops in Detroit and Baltimore.
World Cup mania hits Day 2 as the US opens group stage play against Paraguay.
Cole Young, Luke Raley and Dominic Canzone homered for Seattle.
The FIFA World Cup is now underway, as the US gears up for its opener on Friday with a pair of PNW-hosted matches to follow.
The international tournament began Thursday, days before Seattle and Vancouver host their first matches.
The Mariners are 4-17 this season when they do not hit a home run.
Randy Arozarena’s go-ahead homer was the difference in the M’s extra-innings win in Baltimore.
Mitch Garver also homered for the AL West-leading Mariners, who have won 11 of their last 14 games.
The 2026 World Cup runs from June 11 to July 19 at stadiums in the United States, Canada and Mexico.
The Big Grumper’s fifth-inning grand slam was the difference as the Mariners took their series opener in Baltimore.