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The Arizona Diamondbacks (12-15) and Seattle Mariners (14-12) play the 2nd game of a 3-game series at T-Mobile Park Saturday. First pitch is scheduled for 9:40 p.m. ET (FS1). Let’s analyze BetMGM Sportsbook’s lines around the Diamondbacks vs. Mariners odds and make our expert MLB picks and predictions for the best bets.
Season series: Mariners lead 1-0
The Diamondbacks, who were -124 favorites, lost 6-1 in the series opener Friday with the Under (7.5) hitting in Seattle. Arizona has lost back-to-back games and 7 of 11.
RF Mitch Haniger hit a grand slam in the 6th inning for the Mariners, who cashed as +115 underdogs. Seattle has won 2 straight games and 8 of 10.
Diamondbacks at Mariners projected starters
RHP Slade Cecconi vs. RHP George Kirby
Cecconi (1-0, 3.00 ERA) makes his 2nd start. The rookie allowed 2 earned runs on 2 hits and 0 walks with 3 K’s in 5 1/3 innings in his season debut, a 5-3 road victory over the San Francisco Giants Sunday.
- Career road stats: 1-0, 3.63 ERA (17 1/3 IP, 7 ER), 0.98 WHIP in 3 starts and 1 relief appearance
- Has never faced Seattle before
Kirby (2-2, 5.33 ERA) makes his 6th start. He has a 1.30 WHIP, 1.1 BB/9 and 9.2 K/9 in 25 1/3 innings.
- Last start: No-decision, 5 IP, 0 ER, 5 H, 1 BB, 7 K in 2-1 loss in 10 innings at Colorado Rockies Sunday
- 2024 home stats: 2-1, 5.51 ERA (16 1/3 IP, 10 ER), 1.16 WHIP in 3 starts
- Has never faced Arizona before
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Diamondbacks at Mariners odds
Provided by BetMGM Sportsbook; access USA TODAY Sports Scores and Sports Betting Odds hub for a full list. Lines last updated at 11:40 a.m. ET.
- Moneyline (ML): Diamondbacks +125 (bet $100 to win $125) | Mariners -155 (bet $155 to win $100)
- Run line (RL)/Against the spread (ATS): Diamondbacks +1.5 (-165) | Mariners -1.5 (+140)
- Over/Under (O/U): 7.5 (O: +100 | U: -130)
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Diamondbacks at Mariners picks and predictions
Prediction
Mariners 5, Diamondbacks 2
Moneyline
The Mariners (-155) will likely win, but I prefer taking the plus odds on their run line.
PASS. Bet the run line and/or total instead.
Run line/Against the spread
While the Mariners have won 8 of their last 10 games straight up, they’ve also been blowing teams out. Ten of their last 11 victories have been by multiple runs, while Arizona’s last 6 losses have all been by 2 or more.
Kirby has allowed 2 or fewer runs in back-to-back starts. He should be able to keep the struggling Diamondbacks in check for 5+ innings while the Seattle offense goes to work against Arizona’s rookie starter.
BET MARINERS -1.5 (+140).
Over/Under
While Kirby has allowed 2 runs or fewer in 3 of his 5 starts this season, I do worry about Seattle’s offense putting up a lot of runs early against Ross. Arizona has scored a total of just 2 runs over its last 2 games, so I would lean Under in this spot; however, 7.5 is a little low for my liking.
LEAN UNDER 7.5 (-130).
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