Red Sox vs Diamondbacks Prediction, Odds, Moneyline, Spread & Over/Under for Aug. 18

Odds updated as of 2:12 a.m.

The Boston Red Sox versus the Arizona Diamondbacks is on the MLB schedule for Tuesday.

Before you do any MLB betting on this game at FanDuel Sportsbook, here's what you need to know.

Red Sox vs Diamondbacks Game Info

• Boston Red Sox (67-58) vs. Arizona Diamondbacks (66-60)
• Date: Tuesday, August 18, 2026
• Time: 7:10 p.m. ET
• Venue: Fenway Park -- Boston, Massachusetts
• Coverage: NESN and Dbacks.TV

Red Sox vs Diamondbacks Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: BOS: (-174) | ARI: (+146)
• Spread: BOS: -1.5 (+120) | ARI: +1.5 (-144)
• Total: 8.5 -- Over: (-115) | Under: (-105)

Red Sox vs Diamondbacks Probable Starting Pitchers

Probable Pitchers: Ranger Suarez (Red Sox) - 4-3, 3.25 ERA vs Merrill Kelly (Diamondbacks) - 8-10, 5.11 ERA

This contest's pitching matchup is set, as the Red Sox will send Ranger Suarez (4-3) to the mound, while Merrill Kelly (8-10) will take the ball for the Diamondbacks. Suarez and his team are 11-10-0 ATS this season when he starts. Suarez's team has been victorious in 53.3% of the games he's started as the moneyline favorite with a record of 8-7. The Diamondbacks have a 12-10-0 record against the spread in Kelly's starts. The Diamondbacks are 5-8 in Kelly's 13 starts this season that they were the moneyline underdog.

Red Sox vs Diamondbacks Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Red Sox win (66.2%)

Red Sox vs Diamondbacks Moneyline

• Looking at the moneyline for Diamondbacks-Red Sox, Arizona is the underdog at +146, and Boston is -174 playing at home.

Red Sox vs Diamondbacks Spread

• The Diamondbacks are +1.5 on the spread (-144 to cover), and Boston is +120 to cover the runline.

Red Sox vs Diamondbacks Over/Under

• The over/under for the Red Sox versus Diamondbacks contest on Aug. 18 has been set at 8.5, with -115 odds on the over and -105 odds on the under.

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Red Sox vs Diamondbacks Betting Trends

• The Red Sox have been victorious in 44, or 52.4%, of the 84 contests they have been chosen as favorites in this season.
• This season Boston has been victorious five times in nine chances when named as a favorite of at least -174 on the moneyline.
• The Red Sox and their opponents have gone over the total this season in 55 of their 123 opportunities.
• The Red Sox are 60-63-0 against the spread in their 123 games with a line set by sportsbooks this season.
• The Diamondbacks have won 45.7% of the games this season they were the underdog on the moneyline (32-38).
• In games it has played as a moneyline underdog with odds of +146 or longer, Arizona has gone 8-7 (53.3%).
• The Diamondbacks have had an over/under set by oddsmakers 125 times, and have combined with opponents to go over the total in 53 of those games (53-68-4).
• The Diamondbacks have put together a 67-58-0 record against the spread this season (covering 53.6% of the time).

Red Sox Player Leaders

• Wilyer Abreu is hitting .259 with 27 doubles, three triples, 22 home runs and 56 walks. He has an on-base percentage of .337 and a slugging percentage of .473.
• Among qualified hitters, he ranks 67th in batting average, his on-base percentage ranks 64th, and he is 32nd in slugging.
• Ceddanne Rafaela has hit 16 homers this season while driving in 64 runs. He's batting .288 this season and slugging .470 with an on-base percentage of .325.
• He is 16th in batting average, 83rd in on-base percentage and 37th in slugging in the major leagues.
• Willson Contreras leads Boston with 110 hits and an OBP of .391 this season.
• Caleb Durbin has 12 home runs, 61 RBI and a batting average of .257 this season.
• Durbin heads into this game on a three-game hitting streak. In his last five games he is batting .421 with a home run, three walks and six RBIs.

Diamondbacks Player Leaders

• Corbin Carroll paces the Diamondbacks with 113 hits. He's batting .247 and slugging .488 with an on-base percentage of .344.
• He is 87th in batting average, 54th in on-base percentage and 26th in slugging percentage among all qualifying hitters in the big leagues.
• Geraldo Perdomo has 16 doubles, six triples, nine home runs and 73 walks while hitting .245. He's slugging .372 with an on-base percentage of .355.
• His batting average is 91st among all qualified players, his on-base percentage ranks 39th, and he is 121st in slugging.
• Gabriel Moreno has a team-best .384 on-base percentage.
• Nolan Arenado is batting .241 with 20 doubles, a triple, 20 home runs and 42 walks.

Red Sox vs Diamondbacks Head to Head

• 8/17/2026: 11-1 BOS (Favorite: Red Sox, Spread: -1.5, Total: 9, Favorite Moneyline: -130, Underdog Moneyline: +120)
• 9/7/2025: 7-4 BOS (Favorite: Diamondbacks, Spread: -1.5, Total: 8.5, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 9/6/2025: 5-1 ARI (Favorite: Red Sox, Spread: -1.5, Total: 9, Favorite Moneyline: -120, Underdog Moneyline: +102)
• 9/5/2025: 10-5 ARI (Favorite: Red Sox, Spread: -1.5, Total: 9, Favorite Moneyline: -134, Underdog Moneyline: +114)
• 8/25/2024: 7-5 ARI (Favorite: Red Sox, Spread: -1.5, Total: 9, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 8/24/2024: 4-1 ARI (Favorite: Red Sox, Spread: -1.5, Total: 9.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 8/23/2024: 12-2 ARI (Favorite: Red Sox, Spread: -1.5, Total: 9.5, Favorite Moneyline: -126, Underdog Moneyline: +108)
• 5/28/2023: 4-2 ARI (Favorite: Diamondbacks, Spread: -1.5, Total: 8.5, Favorite Moneyline: -130, Underdog Moneyline: +110)
• 5/27/2023: 2-1 BOS (Favorite: Diamondbacks, Spread: -1.5, Total: 9, Favorite Moneyline: -108, Underdog Moneyline: -108)
• 5/26/2023: 7-2 BOS (Favorite: Red Sox, Spread: -1.5, Total: 9, Favorite Moneyline: -126, Underdog Moneyline: +108)

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