Arizona Diamondbacks vs. Seattle Mariners, Picks and Prediction, Sunday, May 31, 2026
Use Code WWWC Arizona (31-25) will be going for their third consecutive road series win when they visit T-Mobile Park on Sunday afternoon to face Seattle (29-29) in the final game of their three-game series at 4:10 PM. ET. Read on to find out which team picks up the win in this Diamondbacks vs. Mariners prediction. Don’t go down on strikes! Get our top MLB Predictions and increase your bankroll!
Merrill Kelly, 5-3, 5.25 ERA, will get the start for the Diamondbacks. The Mariners will counter with Bryce Miller, 1-0, 2.25 ERA.
Arizona and Seattle split their last 10 meetings.
**This preview was written before Saturday’s game was played.**
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Diamondbacks Trying To Stay Hot
The Diamondbacks played well over the past couple of weeks, and they’ve won their last four series. They are now third in the NL West standings, one game behind the second-placed Padres, and will try to move into a tie for second with a win on Sunday.
Arizona averages 4.66 runs per game, which is 10th in the league. Their .249 batting average is fifth in the league. Their .315 on base percentage is 19th, while their .403 slugging percentage is sixth.
Ildemaro Vargas leads the Diamondbacks with a .295 batting average and 37 RBI, while Ketel Marte leads the team with nine home runs.
Arizona is giving up 4.43 runs per game, which is 15th in the league. Opponents have a .241 batting average against the Diamondbacks, which is 16th in the league. Their 4.05 ERA is also 16th, while their 1.24 WHIP is ninth.
In his last start, Kelly gave up four hits and two runs in seven innings, leading to a 6-2 win over San Francisco.
Mariners Going For Second Consecutive Series Win
The Mariners bounced back from their series loss to the Royals with a series win over the Athletics. They will try to keep the momentum going and pick up their second straight series win when they face the Diamondbacks.
Seattle averages 4.26 runs per game, which is 17th in the league. Their .233 batting average is 22nd in the league. Their .318 on base percentage is 15th, while their .390 slugging percentage is 12th.
Randy Arozarena leads the Mariners with a .297 batting average, while Luke Raley leads the team with 12 home runs and 30 RBI.
Seattle is giving up 3.83 runs per game, which is fifth in the league. Opponents have a .249 batting average against the Mariners, which is 22nd in the league. Their 3.57 ERA is fifth, while their 1.23 WHIP is seventh.
In his last start, Miller gave up five hits and two runs in five innings, leading to a 9-2 win over the Athletics.
Diamondbacks vs. Mariners Picks
Money Line Pick for Diamondbacks vs. Mariners
- Seattle Mariners ML (4 Units)
The Mariners have the edge here because they’re playing well offensively, scoring at least seven runs in three of their last four games. They’ve had a lot of success batting against right-handers, and they’re facing Kelly, who struggled on the mound in recent starts, especially on the road, where he gave up nine runs in his last three starts, so expect them to play well offensively in this game.
The Diamondbacks will have a hard time keeping up because they aren’t playing as well as the Mariners, scoring 15 runs in their last three games. They’ve struggled against right-handers, and they’re facing Miller, who has done well on the mound for the Mariners, giving up four runs in three games. He hasn’t given up a run at home so far, so expect him to keep Arizona’s offense in check. Take Seattle on the money line.
Over/Under Pick for Diamondbacks vs. Mariners
- Under (4 Units)
The Diamondbacks average 4.66 runs per game. They’re batting .235 against right-handers, and they’re facing a starter who gave up two runs in his last two starts. The Mariners average 4.26 runs per game. They’re batting .245 against right-handers, and they’re facing a starter who gave up six runs in his last three starts. Don’t expect these teams to score enough runs to push the score over the total. The Diamondbacks and Mariners played under the total in seven of their last 10 meetings.
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