The Philadelphia Phillies head to the Pacific Northwest for a Tuesday night matchup against the Seattle Mariners at T-Mobile Park, with first pitch scheduled for 9:40 PM ET. Aaron Nola takes the ball for Philadelphia against Seattle's George Kirby in what shapes up as a classic pitchers' duel. This is a regular season game with real standings implications, and a Phillies team making a late-August road trip to one of the tougher environments in the American League needs a quality start from their veteran right-hander to come away with a win.

Phillies vs. Mariners: Tuesday August 25, 2026 Game Preview

T-Mobile Park is no easy place to play. The Mariners have built their identity around pitching and defense, and Kirby fits that mold as well as anyone in their rotation. He works with elite command, challenging hitters in the zone and punishing free swingers. The Phillies are going to need patience at the plate and a willingness to grind deep into counts if they want to get into the Seattle bullpen.

Starting Pitchers: Aaron Nola vs. George Kirby

Nola is the anchor of this Philadelphia staff, a pitcher who has given this organization consistency year after year. He mixes a sharp curveball with a four-seam fastball and a changeup, and his ability to command multiple pitches keeps lineups off balance deep into games. Against a Mariners lineup that is built around contact and manufacturing runs rather than hitting the ball over the fence, Nola's profile is a strong matchup on paper.

Kirby, meanwhile, is one of the better young starters in the American League. His fastball command is exceptional and he rarely beats himself with walks. The Phillies will need to be aggressive early in counts and look to do damage when Kirby offers something in the hitting zone, because he is not the type of pitcher who is going to hand out free passes.

Keys to the Game for Philadelphia

• Nola must limit the big inning. Seattle can string together contact and put up crooked numbers if a starter loses his command for even one stretch.
• The Philadelphia lineup needs to be disciplined against Kirby. Working counts, taking pitches, and making him work will be essential to getting into the Mariners bullpen.
• Defense matters at T-Mobile Park. The Phillies need to be clean in the field behind Nola to keep the game manageable.
• Late-game bullpen management will be critical, especially on the road in a nine-inning game where the Phillies do not have a home crowd behind them.

How to Watch and Listen

Philadelphia fans can catch the game on NBCSP on television or tune in on 94 WIP on the radio. Spanish-language listeners can follow along on the iHeart App. Seattle-side coverage airs on Mariners.TV and Seattle Sports 710 AM.

Prediction

This one hinges on Nola. If he is on and limiting hard contact, the Phillies have enough in their lineup to scratch out the runs they need against Kirby. A pitchers' duel feels like the natural outcome here, and in those situations the team that avoids the big mistake tends to win. Give the slight edge to the Phillies, 3-2, on the strength of Nola going deep into the game and keeping Seattle's offense in check.