Arizona Diamondbacks vs Seattle Mariners Prediction, Odds and Picks for Today, 05/29/26

After outscoring the Athletics 22-4 in a 3-game series, the Seattle Mariners will look to keep their offense rolling as they prepare to take on a red-hot Arizona Diamondbacks team. Arizona has won 9 of their last 10 games, and in that span, they’re averaging 5.7 runs per game and hitting .287. Meanwhile, the Mariners are averaging 4.5 runs per game and hitting .225 over their last 10 games — winning 6 of those contests. 

Zac Gallen will get the start for Arizona, entering with a 3-4 record, 4.80 ERA and a 1.44 WHIP. However, he’s shown signs of improvement lately, going 2-0 with a 3.97 ERA over his last 2 starts. Seattle will counter with George Kirby, who is 5-4 with a 3.54 ERA and 1.21 WHIP this season. That said, Kirby has struggled recently, dropping his last 2 starts while posting a 6.94 ERA in that span.

The Diamondbacks have been one of the hottest offenses in baseball during the month of May, which makes this a difficult matchup for Kirby. He struggled against the Royals and Padres in recent outings, and neither lineup has been swinging the bats nearly as well as Arizona right now. While both starters are capable of settling in and pitching effectively, each has also shown inconsistency this season. With Arizona’s surging offense and Seattle coming off a dominant offensive series of its own, this matchup sets up well for runs to be scored on both sides. Rather than trusting either team outright, the better value looks to be on the over in what could turn into another high-scoring game. 

Diamondbacks vs Mariners prediction: Over 7 (-115) at the time of publishing. Playable up to 8 (-110). 

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