Seattle Mariners vs
Arizona DiamondbacksPredictions & Preview

Arizona Diamondbacks Favored Over Seattle Mariners in MLB Matchup as Merrill Kelly Takes the Mound

The 2025 MLB season continues with the Seattle Mariners facing off against the Arizona Diamondbacks at Chase Field in Phoenix, AZ. The Diamondbacks are -165 moneyline favorites with a total of 9.0 runs. Last season, Arizona won two out of three games against Seattle, with all games going under the total. Emerson Hancock will start for the Mariners with Merrill Kelly starting for the Diamondbacks. Arizona opened as -168 favorites and the current line is Arizona -167. The game is set to start at 9:40 PM ET. For more insights and MLB picks for Monday's slate, read our Seattle vs. Arizona prediction.

Betting Odds

• Moneyline: Mariners +148 | Diamondbacks -167
• Spread: Mariners +1.5 (-140) | Diamondbacks -1.5 (+120)
• Total: Over/Under 9.5 (-110)
• Based on the moneyline, the implied probability that Arizona will win straight-up is 63%.

Seattle vs Arizona Stats

Seattle Mariners

The analysis excludes Sunday's games, focusing on the Seattle Mariners' visit to the Los Angeles Angels in a three-game series. The struggling Mariners aim to end their five-game losing streak, having won only two of their last 10 games. They have scored 32 runs with a .233/.276/.353 triple-slash and a 5.28 ERA during this stretch. Emerson Hancock is set to pitch, with a 5.19 ERA and 1.47 WHIP this season. In his last outing, he allowed one earned run in 5.2 innings. Against the Diamondbacks, Hancock has a strong record, with the current players being 0-for-15 against him. Seattle ranks 13 in offense, 21 in defense, with a 33-31 season record.

Arizona Diamondbacks Analysis

The Arizona Diamondbacks visited the Cincinnati Reds on Sunday afternoon, aiming to avoid a sweep after losing consecutive games in the three-game series. Despite recent struggles, the Diamondbacks have shown offensive prowess, averaging 5.02 runs per game. Pitcher Merrill Kelly, with a 6-2 record and 3.43 ERA, is expected to start on Monday. In previous matchups with Seattle, Kelly allowed four home runs in one game and will look to bounce back. Overall, the Diamondbacks hold a power ranking of 20 and currently have a record of 31-34.

Merrill Kelly Looks to Lead Diamondbacks to Victory Against Mariners

After a couple of challenging outings in May, Merrill Kelly displayed a strong comeback in his recent performances. With the Seattle Mariners poised to face the Diamondbacks, I anticipate a solid performance by Kelly. Given the current offensive strength of the Diamondbacks compared to the Mariners, I am predicting Arizona to succeed on the runline. Over the past 10 days, the Diamondbacks have excelled against right-handed pitchers with a .867 OPS and 142 wRC+. Despite an initial hitless record against Emerson Hancock, I am confident that they will turn the tide on Monday night. On the other hand, the Mariners have shown moderate success against righties, with a .720 OPS and 108 wRC+ in the same timeframe. Both teams' bullpens have faced challenges recently, with the Diamondbacks recording a 4.42 ERA and 1.55 WHIP, compared to the Mariners' 5.50 ERA and 1.60 WHIP.

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