Mariners vs. Diamondbacks Prediction, Odds, Probable Pitchers and Prop Bets for Monday, June 9

Sean Treppedi | Jun 9, 2025

Cal Raleigh's home run prop against the Diamondbacks on Monday offers worthwhile value. / Joe Nicholson-Imagn Images

Seattle opens its series against the Diamondbacks with some rough games in recent games, sporting a 3-7 record in its last 10. It comes off a win to the Angels as it trails the AL West lead by 2 ⅕ games. 

Meanwhile, Arizona hasn’t been any more consistent, going 4-6 in its last 10 and sinking to 7 ½ games back in an incredibly competitive NL West landscape. 

This interleague matchup will kick off with Emerson Hancock (2-2, 5.19 ERA) on the mound for Seattle against Arizona’s Merrill Kelly (6-2, 3.43 ERA). Both had strong last starts, but run support from their respective offenses has been a problem.

Let’s break it down and talk about what picks present value here. 

Mariners vs. Diamondbacks Odds, Run Line and Total

Odds via FanDuel Sportsbook

Run Line

• Mariners +1.5 (-140)
• Diamondbacks -1.5 (+116)

Moneyline

• Mariners (+146)
• Diamondbacks (-174)

Total

• Over 9 (-122)
• Under 9 (+100)

Mariners vs. Diamondbacks  Probable Pitchers

• Mariners: Emerson Hancock (2-2, 5.19 ERA)
• Diamondbacks: Merrill Kelly (6-2, 3.43 ERA)

Mariners vs. Diamondbacks How to Watch

• Date: Monday, June 9, 2025
• Time: 9:40 p.m. ET
• Venue: Chase Field
• How to Watch (TV): FS1, ROOTNW
• Mariners Record: 33-31
• Diamondbacks Record: 31-34

Mariners vs. Diamondbacks Best MLB Prop Bet

• Cal Raleigh Home Run (+200 at BetMGM)

This isn’t the first time I’ve suggested a Raleigh home run prop, and it likely won’t be the last. I think there’s solid value at +290. He’s leading the MLB with 26 home runs and has three in his last three games. He’s also second in the league with a 1.035 OPS and has hit 11 home runs in his last 17 games, with three multi-homer games. Raleigh has crushed right-handed pitching for 18 homers and could benefit further against Arizona’s 27th-ranked bullpen in ERA (5.28).

Mariners vs. Diamondbacks Prediction and Pick

There’s enough reasoning to take the road dog value at Chase Field. I don’t have much conviction about either side of the starting pitching, but Seattle has a significant advantage with its bullpen. As previously mentioned, Arizona’s pen has been abysmal, sporting a 1.45 WHIP. The Mariners’ staff enters Monday with more rest and are top-10 in saves (19). Both defenses are fairly similar in efficiency ratio, and while Arizona has a more consistent lineup, Seattle is much more effective on the road, batting .260/.344/.417.

Pick: Mariners (+146 at FanDuel)

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