MLB Prop Bets: Arizona Diamondbacks vs San Francisco Giants (May 18, 2026)
The San Francisco Giants (20-27) face the Arizona Diamondbacks (22-23) at Chase Field on Monday at 9:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Robbie Ray is the probable pitcher for the Giants, while Zac Gallen is the probable pitcher for the Diamondbacks. The Diamondbacks are favored to win at -143, while the Giants are at +119. The total runs line is set at 9.0, with OVER at -114 and UNDER at -105.
- The Giants (-175) have a 22-25 Run Line record this season, while the Diamondbacks (+144) hold a record of 27-18.
- The Giants have a 20-25-2 O/U record this season (meaning 20 games have gone over the total runs line, 25 have gone under and two have resulted in a push). The Diamondbacks have a 21-20-4 O/U record.
Scoring Insights
- The Giants are averaging 3.5 runs per game this season (30th in the league). Comparatively, the Diamondbacks are averaging +0.9 more at 4.4 runs (13th).
- In the field, the Giants are allowing 4.3 runs per game this season (14th in the league), while the Diamondbacks are allowing an average of 4.8 runs (23rd).
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 Giants are at .244 (ranking 10th in the Major leagues), while the Diamondbacks are batting .239 (16th).
Home Runs
- In terms of total home runs this season, the Diamondbacks have hit 40 (24th in the Major Leagues). Meanwhile, the Giants have managed 37 (27th).
Runs Batted In
- Finally, looking at their runs batted in, the Giants have recorded 159 RBIs to rank 30th in the MLB this season. Comparatively, the Diamondbacks have recorded 191 RBIs to rank T19th.
Pitching Insights:
Earned Run Average
- The Diamondbacks have an earned run average of 4.39 this season (24th in the Majors), while The Giants have an ERA of 3.97 (14th).
Strikeouts
- Turning our attention to total strikeouts, the Giants have recorded 372 this season, ranking 20th in the MLB. Meanwhile, the Diamondbacks rank 29th for total strikeouts, recording 333.
Opponent Batting Average
- Opponents are batting an average of .243 against the Diamondbacks this season (18th in the Major Leagues). Comparatively, the Giants' opponents are at .240 (16th).
First Innings Moneyline
- Here are their first innings moneyline records in 2026.
| Total | Home | Road | Favorite | Underdog | Neutral | Last 10 | |
|---|---|---|---|---|---|---|---|
| Giants | 9-10-28 | 5-3-14 | 4-7-14 | 2-3-9 | 7-7-19 | 0-0-0 | 1-3-6 |
| Diamondbacks | 10-13-22 | 4-5-10 | 6-8-10 | 4-3-8 | 6-10-14 | 0-0-2 | 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 | |
|---|---|---|---|---|---|---|---|
| Giants | 15-22-10 | 6-10-6 | 9-12-4 | 3-7-4 | 12-15-6 | 0-0-0 | 3-5-2 |
| Diamondbacks | 16-20-9 | 8-5-6 | 7-14-3 | 9-2-4 | 7-18-5 | 1-1-0 | 6-2-2 |
NRFI/YRFI
The NRFI market is paying -120 and the YRFI is paying -110.
- The NRFI is 28-19 in Giants games this season. The Diamondbacks have a 19-26 NRFI record.
Last Time They Met
The Giants recorded a 5-1 extra innings victory over the Diamondbacks at Chase Field when these teams last met on September 17, 2025. Despite being on the wrong side of that result, Corbin Carroll did what he could, hitting a home run. That result snapped the Diamondbacks' three-game winning streak against the Giants.
