Arizona Diamondbacks vs Seattle Mariners Picks and Prediction for Sunday May 31 2026
The Arizona Diamondbacks and Seattle Mariners continue their series on Sunday, May 31, 2026, at T-Mobile Park in Seattle, Washington. First pitch is scheduled for 4:10 PM ET, and the game will be televised on MLB.TV. Arizona enters this matchup after seeing a four-game winning streak come to an end, while Seattle is looking to extend its recent surge after winning four of its last five contests. At the time of this writing the odds were not released. Be sure to check out our free MLB picks.
Starting Pitchers
Arizona is expected to send Merrill Kelly to the mound on Sunday afternoon. Kelly enters the contest with a 5-3 record, a 5.25 ERA, and a 1.42 WHIP across 48.0 innings. He has allowed 48 hits while striking out 31 batters and walking 20. He has also surrendered eight home runs. Seattle is scheduled to counter with Bryce Miller, who owns a 1-0 record with a 2.25 ERA and a 1.00 WHIP over 16.0 innings. Miller has allowed 14 hits while recording 14 strikeouts and issuing just two walks. He has given up two home runs. 
Diamondbacks Looking to Regain Momentum
Arizona enters Sunday's game with a 31-25 overall record and a 13-15 road record. The Diamondbacks have won four of their last five games, recently winning over San Francisco three times and Colorado once before dropping a 7-6 extra-inning decision to Seattle. Despite the loss, Arizona has continued to play solid baseball and remains well above .500 entering this matchup.
The Diamondbacks are batting .249 as a team with 261 runs scored, 466 hits, and 49 home runs. Arizona owns a .315 on-base percentage and a .403 slugging percentage. On the mound, the Diamondbacks have produced a 4.05 ERA and a 1.24 WHIP while limiting opponents to a .241 batting average. The pitching staff has also recorded 401 strikeouts.
One of Arizona's biggest strengths has been its offensive consistency. The Diamondbacks hold advantages over Seattle in batting average, runs scored, and hits. Those categories have helped Arizona remain competitive throughout the season despite playing just below .500 on the road.
Mariners Building Confidence at Home
Seattle enters this contest with a 29-29 overall record and a 15-15 home record. The Mariners have won four of their last five games, recently winning over Arizona and the Athletics three times. Their only loss during that stretch came against Kansas City. Seattle's offense has produced 29 runs during its four victories, helping the club climb back to the .500 mark.
The Mariners are batting .233 with 247 runs scored, 448 hits, and 70 home runs. Seattle owns a .318 on-base percentage and a .390 slugging percentage. Defensively, the Mariners have been strong, posting a 3.57 ERA and a 1.23 WHIP while allowing opponents to hit .249. The pitching staff has also accumulated 492 strikeouts.
The greatest strength for Seattle has been its pitching staff. The Mariners hold advantages in ERA, WHIP, and strikeouts. Their 3.57 ERA is significantly lower than Arizona's mark, and their ability to generate strikeouts has been a major factor in keeping games under control.
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Arizona Diamondbacks vs Seattle Mariners Picks and Prediction
Arizona Diamondbacks vs Seattle Mariners Pick
- Pick: Seattle Mariners Moneyline
Seattle enters this matchup with momentum after winning four of its last five games and taking the series opener in extra innings. The Mariners also hold significant advantages in ERA, WHIP, and strikeouts, while the starting pitching matchup favors Seattle based on the season numbers provided. With Seattle playing at home and carrying the stronger pitching profile, the Mariners are the preferred side.
Arizona Diamondbacks vs Seattle Mariners Total Pick
- Pick: Take the over if the total is set at 8.0
I would lean toward the over if the total is posted around 8.0 runs. Friday's meeting produced 13 total runs, and Arizona has scored six or more runs in four of its last five games. While Seattle owns strong pitching numbers overall, the recent offensive production from both clubs suggests there could be enough scoring opportunities to push this game over a modest total.
Final Score Prediction: Seattle Mariners 5 – Arizona Diamondbacks 4
This prediction was written before the completion of game play on Saturday.
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