Philadelphia Phillies vs Seattle Mariners Picks and Prediction for Tuesday August 25 2026

The Philadelphia Phillies visit the Seattle Mariners at T-Mobile Park in Seattle, Washington, on Tuesday, August 25, 2026. First pitch is scheduled for 9:40 PM ET with coverage on MLB.TV. Philadelphia enters at 73-58 overall and 35-28 on the road, while Seattle is 62-69 overall and 35-30 at home. The Phillies are one of the hottest teams in baseball, carrying a nine-game winning streak into this matchup, while Seattle has gone 3-2 over its last five. At the time of this writing the odds were not released. Be sure to check out our free MLB picks throughout the season for more baseball betting predictions and analysis.

Starting Pitchers

Philadelphia is expected to start Aaron Nola, who enters at 5-9 with a 5.12 ERA and 1.42 WHIP over 137 innings. Nola has allowed 148 hits while striking out 146 and walking 46, but the 31 home runs surrendered stand out as the biggest concern in his profile. Seattle counters with George Kirby, who is 8-10 with a 4.18 ERA and 1.36 WHIP through 140 innings. Kirby has allowed 157 hits with 117 strikeouts, 33 walks and 17 home runs. Seattle owns the edge in the starting matchup based on ERA, WHIP and home-run prevention.

Phillies Keep Rolling

Philadelphia comes into Tuesday at 73-58 and has surged to within three games of the division lead. The Phillies have won nine straight and each of their last five, beating their most recent opponents by scores of 6-4, 12-3, 7-6, 4-1 and 6-4. That run has included both close games and comfortable victories, which speaks to the variety of ways this club has been finding wins.

The Phillies are batting .243 as a team with 1,068 hits, 599 runs and 158 home runs. Their .314 on-base percentage and .404 slugging percentage both compare favorably with Seattle's overall offensive production. Philadelphia has scored 86 more runs and hit nine more home runs than the Mariners entering this matchup.

Pitching has been more uneven. Philadelphia owns a 4.11 team ERA and 1.30 WHIP, with opponents hitting .250. Those numbers are nearly identical to Seattle's staff ERA, though the Phillies have generated considerably more strikeouts. The biggest question is whether Philadelphia can continue its offensive momentum enough to overcome an unfavorable starting-pitching matchup.

Mariners Need a Response at Home

Seattle enters at 62-69 and sits three games out in the American League West. The Mariners are 35-30 at home and have won three of their last five, though their most recent game ended in a disastrous 19-2 loss. Before that defeat, Seattle had picked up consecutive wins by scores of 5-4 and 6-5, showing some ability to win tight games.

The Mariners are batting just .229 with 995 hits, 513 runs and 149 home runs. They own a .309 on-base percentage and .375 slugging percentage. The largest difference between these offences is run production, with Philadelphia holding a substantial advantage despite both clubs showing respectable home-run power.

Seattle's team pitching numbers are a 4.12 ERA and 1.24 WHIP, with opponents batting .249. The lower WHIP is notable and gives the Mariners a modest overall efficiency advantage on the mound. That combines with Kirby's stronger individual numbers to give Seattle a legitimate chance to slow down Philadelphia's winning streak.

Philadelphia Phillies vs Seattle Mariners Picks and Prediction

Pick: Philadelphia Phillies Moneyline

Seattle owns the better starting-pitching matchup, but Philadelphia's current form is too strong to ignore. The Phillies have won nine straight, have the superior overall record and have been significantly more productive offensively across the season. They have scored 599 runs compared with Seattle's 513 and carry more power, a better slugging percentage and better recent momentum. Nola's home-run issues create risk, but Philadelphia has enough offensive upside to overcome it. The preferred side is the Phillies moneyline.

Pick: Over 8.5

The pitching matchup creates a stronger case for the over than the raw team ERAs might suggest. Nola enters with a 5.12 ERA and has surrendered 31 home runs, while Kirby has a 4.18 ERA and has allowed plenty of hits despite keeping walks low. Philadelphia is also riding a major offensive hot streak and has scored at least four runs in each of its last five games. If the total is set at 8.5, the better play is the Over.

This game preview was completed before play on Monday, August 24, 2026.