MLB Prop Bets: Boston Red Sox vs Arizona Diamondbacks (August 18, 2026)
The Arizona Diamondbacks (66-60) face the Boston Red Sox (67-58) at Fenway Park on Tuesday at 7:10pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Merrill Kelly is the probable pitcher for the Diamondbacks, while Ranger Suarez is the probable pitcher for the Red Sox. The Red Sox are favored to win at -171, while the Diamondbacks are at +141. The total runs line is set at 8.5, with OVER at -107 and UNDER at -113.
- The Diamondbacks (-155) have a 70-56 Run Line record this season, while the Red Sox (+128) hold a record of 61-64.
- The Diamondbacks have a 51-66-9 O/U record this season (meaning 51 games have gone over the total runs line, 66 have gone under and nine have resulted in a push). The Red Sox have a 57-64-4 O/U record.
Scoring Insights
- The Diamondbacks are averaging 4.5 runs per game this season (14th in the league). Comparatively, the Red Sox are averaging 4.5 (15th).
- In the field, the Diamondbacks are allowing 4.4 runs per game this season (17th in the league), while the Red Sox are allowing an average of 3.8 runs (1st).
Let's take a look at how these teams perform in some other key statistical areas.
Batting Insights:
Batting Average
- Looking at their batting averages this season, the Diamondbacks are at .243 (ranking 17th in the Major leagues), while the Red Sox are batting .249 (9th).
Home Runs
- In terms of total home runs this season, the Red Sox have hit 126 (25th in the Major Leagues). Meanwhile, the Diamondbacks have managed 124 (27th).
Runs Batted In
- Finally, looking at their runs batted in, the Diamondbacks have recorded 540 RBIs to rank 15th in the MLB this season. Comparatively, the Red Sox have recorded 536 RBIs to rank 17th.
Pitching Insights:
Earned Run Average
- The Red Sox have an earned run average of 3.50 this season (3rd in the Majors), while The Diamondbacks have an ERA of 4.13 (16th).
Strikeouts
- Turning our attention to total strikeouts, the Diamondbacks have recorded 852 this season, ranking 29th in the MLB. Meanwhile, the Red Sox rank 12th for total strikeouts, recording 1067.
Opponent Batting Average
- Opponents are batting an average of .239 against the Red Sox this season (14th in the Major Leagues). Comparatively, the Diamondbacks' opponents are at .251 (23rd).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Diamondbacks | 29-33-64 | 17-13-31 | 12-20-31 | 16-10-25 | 13-23-39 | 0-0-2 | 5-1-4 |
| Red Sox | 27-36-62 | 16-15-30 | 11-21-32 | 19-22-43 | 8-14-19 | 0-0-0 | 2-2-6 |
Lead After Three Innings
- Here are their records after the first three innings in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Diamondbacks | 41-58-27 | 26-20-15 | 14-37-12 | 23-15-13 | 18-43-14 | 1-1-0 | 6-3-1 |
| Red Sox | 52-45-28 | 30-20-11 | 22-25-17 | 39-27-18 | 13-18-10 | 0-0-0 | 4-3-3 |
NRFI/YRFI
The NRFI market is paying -120 and the YRFI is paying -110.
- The NRFI is 56-70 in Diamondbacks games this season. The Red Sox have a 60-65 NRFI record.
Last Time They Met
The Red Sox recorded a lopsided 11-1 victory against the Diamondbacks at Fenway Park yesterday. Willson Contreras was unstoppable in that matchup, hitting a home run, a double and recording an RBI. That result snapped the Diamondbacks' three-game winning streak against the Red Sox at Fenway Park.
