Interleague action heads to the Pacific Northwest this Monday, June 1, 2026, as the New York Mets travel to T-Mobile Park to open a three-game series against the Seattle Mariners.

Both teams enter June trying to find their footing for a summer push. Seattle looks to defend its home turf and build on a solid start, while the Mets are eager to kick off their road trip with a statement win. Below, we break down the projected starting pitchers, key betting trends, and the absolute best bets for tonight’s Mets vs. Mariners clash. To lock in the best value for tonight’s cross-country matchup, make sure to cross-reference the newest live MLB betting odds.

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Game Info & Betting Odds

• Matchup: New York Mets at Seattle Mariners
• Date: Monday, June 1, 2026
• Time: 9:40 PM ET
• Location: T-Mobile Park, Seattle, WA

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Projected Starting Pitchers

Mets: Sean Manaea (LHP) The Mets hand the ball to veteran left-hander Sean Manaea. The deceptive southpaw relies heavily on an awkward arm angle and a strong sinker-changeup mix to keep hitters off-balance. Manaea has shown he can control the game when he stays out of the heart of the plate, but his success hinges on his command. Facing a Mariners lineup that can run hot and cold against lefties, Manaea will need to attack the zone early.

Mariners: Emerson Hancock (RHP) The Mariners counter with right-hander Emerson Hancock, who enters tonight’s contest with a strong 4-2 record and a stellar 2.78 ERA. Hancock has been highly reliable for Seattle, leaning on a heavy sinker and an effective slider to induce weak contact and roll double plays. For a deeper look at his advanced metrics and home splits this season, head over to Baseball Reference.

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Key Betting Trends & Analysis

T-Mobile Park is widely recognized as one of the premier pitcher-friendly environments in Major League Baseball, and the conditions tonight should hold true to form.

• The Mets’ Outlook: New York’s offense has struggled to find consistency over the last few weeks, making a date with a sub-3.00 ERA right-hander a tough assignment. The Mets will need to focus on stringing together base hits and exploiting any small mistakes Hancock makes.
• The Mariners’ Outlook: Seattle boasts plenty of raw power but is prone to prolonged quiet stretches at the plate. Playing at home gives them a comfortable cushion, especially with their elite bullpen backing up a strong starting option. To track how sharp money is moving for tonight’s game, check out the Action Network MLB public betting splits.

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Mets vs. Mariners Best Bets

Best Bet #1: Under 7.5 Total Runs

T-Mobile Park minimizes extra-base hits, and tonight’s pitching matchup points toward a low-scoring affair. Emerson Hancock’s ground-ball profile should completely neutralize the Mets’ power bats, while Manaea’s heavy movement will keep the Mariners searching for answers. Take the Under.

Best Bet #2: Seattle Mariners Moneyline

The starting pitching edge lies firmly with Seattle. Hancock has been highly efficient at home, and the Mariners boast a superior high-leverage bullpen to lock down the final frames. Back the home favorites to secure a series-opening victory.

Best Bet #3: New York Mets Team Total Under 3.5 Runs

Between Hancock’s stellar 2.78 ERA and Seattle’s lock-down relief corps, scoring opportunities will be rare for the visitors. Expect the Mariners’ pitching staff to keep the Mets’ offense contained throughout the evening.