With a vulnerable arm on the mound for the Arizona Diamondbacks, the Boston Red Sox sit as a heavy -156 moneyline favorite for tonight's clash at Fenway Park. First pitch is scheduled for 7:10 p.m. ET.
My Diamondbacks vs. Red Sox predictions see no issues with Boston grabbing another convincing victory behind left-hander Ranger Suarez.
Read more in my MLB picks for Tuesday, Aug. 18.
Who will win Diamondbacks vs Red Sox today: Red Sox -1.5 (+129)
The Boston Red Sox should be looking forward to this matchup with Merrill Kelly taking the bump for the Arizona Diamondbacks. He's been very hittable lately, posting a 6.36 FIP over his last two starts while surrendering 1.69 HR/9.
Kelly is also hurting himself with walks, issuing 4.44 BB/9 over the last month.
The Red Sox have cooled off a bit offensively, but they just exploded for 11 runs Monday, and Boston still owns a 125 wRC+ over its previous 15 contests.
Ranger Suarez should provide stability. The left-hander owns a 3.19 FIP at Fenway Park in 2026 and a 3.39 FIP over his previous four appearances.
Boston’s offense can create separation.
Play this pick to +110.
COVERS INTEL: Arizona’s offense has traveled poorly this season, posting an 88 wRC+ on the road compared to a 103 mark at Chase Field. That gives Suarez a cleaner matchup and strengthens Boston’s path to separation at Fenway.
Diamondbacks vs Red Sox Over/Under pick: Over 8.5 (-101)
After the Over comfortably hit on Monday, I'm eyeing it again.
The Red Sox are still smashing baseballs, and Arizona’s bullpen is shaky, which means more runs are possible when Kelly exits. The Diamondbacks’ relief corps has a 5.33 xERA over the last week while allowing 1.40 HR/9.
Boston’s bullpen has been a lot steadier during that span with a 3.17 FIP, but Suarez isn’t untouchable. The Diamondbacks’ offense is also above league average right now, and if the Sox score as much as I expect, Arizona won’t need to chip in much for this contest to cash the Over.
Play this pick to -130.
- ML/RL bets: 50-64, -21.47 units
- Over/Under bets: 63-48, +6.04 units
Diamondbacks vs Red Sox weather
Weather at Fenway Park looks mild and humid tonight, with partly cloudy skies and temperatures sitting around 73°F at first pitch before dipping to 71°F later. Winds are light around 3–5 mph, and rain chances stay low near 10–13%. Overall, conditions look fairly neutral with no major delay concern.
Diamondbacks vs Red Sox odds
- Moneyline: Diamondbacks +150 | Red Sox -156
- Run line: Diamondbacks +1.5 (-138) | Red Sox -1.5 (+133)
- Over/Under: Over 8.5 (-100) | Under 8.5 (-104)
Diamondbacks vs Red Sox trend
The Red Sox have covered the run line in 30 of their last 50 games (+15.40 Units / 26% ROI). Find more MLB betting trends for Diamondbacks vs. Red Sox.
How to watch Diamondbacks vs Red Sox and game info
| Location | Fenway Park, Boston, MA |
| Date | Tuesday, Aug. 18, 2026 |
| First pitch | 7:10 p.m. ET |
| TV | Diamondbacks.TV, NESN |
| Diamondbacks starting pitcher | Merrill Kelly (8-10, 5.11 ERA) |
| Red Sox starting pitcher | Ranger Suarez (4-3, 3.25 ERA) |
Diamondbacks vs Red Sox latest injuries
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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