Cincinnati Reds vs Seattle Mariners is a Major League Baseball regular-season interleague game played at T-Mobile Park in Seattle, featuring the home-team Mariners hosting the visiting Reds. The matchup takes place in the Mariners' retractable-roof ballpark in downtown Seattle and is part of the MLB 2026 season. As a regular-season meeting between an American League and a National League club, the game contributes to both teams' standings and draws local fan interest for an interleague contest.