Arizona Diamondbacks vs. San Francisco Giants Picks and Predictions, Tuesday September 9, 2025
Use Code SSWC The National League West has been baseball’s hottest division this season, and as the postseason arrives, every game means that much more, including this one with our Arizona Diamondbacks vs. San Francisco Giants prediction.
The Arizona Diamondbacks (72-73) have been up-and-down for much of the 2025 season, and while their hopes of making a postseason push are low, they’re giving themselves a chance as the September race heats up.
On Tuesday, they battle the San Francisco Giants (73-71), a team that has found genuine momentum as of late, but with little margin for error, they’ll need to be near perfect down the stretch. Read on to see our Arizona Diamondbacks vs. San Francisco Giants prediction.
Expected pitching matchup: RHP Zac Gallen vs. LHP Robbie Ray.
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Can the Diamondbacks keep their post-season hopes alive?
The Arizona Diamondbacks have made a habit of making late-season runs in recent years, but on the back of a 34-39 road record this season, they’re behind the 8-ball once more with the team sitting 5 games back of a Wild Card spot in the National League. Offensively, there are still only a few teams in baseball better than Arizona, as they rank 5th in the league in total runs scored, but with a team ERA of 4.43 on the season, they’ve failed to overcome their weaknesses consistently.
On the mound for Arizona here will be star right-hander Zac Gallen, who has struggled to a 4.77 ERA on the season, with the veteran going 11-13 after giving up a career worst WHIP of 1.28 to this point in time. Last time out for the Diamondbacks was a big loss to these Giants, with three hits to Ketel Marte not enough to keep this one close as all three of the pitchers featured in the game gave up multiple runs, losing the game 11-5 in the process.
Can the Giants continue their momentum as of late?
The San Francisco Giants have been rolling as of late, going 12-3 in their last 15 games as they’ve pulled themselves to within four games of the final Wild Card spot in the National League. Once again, it’s the Giants' pitching leading the way with their 3.76 team ERA, ranking them fifth in baseball, but with an inconsistent lineup that’s now seen them fall to 18th in the league, there are questions over how much noise they can make down the stretch.
In this one, San Francisco will turn to big-time lefty Robbie Ray, who has come back to earth after a red-hot start to the year, putting together a 3.31 ERA on the season, all while striking out an impressive 171 hitters over 168.1 innings of work. Last time out for the Giants was a big blowout win over these D-Backs, with Logan Webb tossing 6.0 innings of two-run ball as the offense went off, with five players tallying two RBI on the night each to lead the team to an 11-5 victory.
Arizona Diamondbacks vs. San Francisco Giants Pick
Spread Pick for Diamondbacks vs. Giants
- San Francisco -148 (4 units)
In the last 10 head-to-head meetings between these teams, the record between the NL West rivals sits at exactly 5-5, with the record between them being 2-2 in their last four meetings played in San Francisco.
However, recent momentum has been on the Giants' side, as they've won the last three coming into this one, outscoring Arizona 24-12 in that time, and with the more consistent Robbie Ray on the mound, expect them to make it four straight wins on Tuesday night.
Over/Under Pick for Diamondbacks vs. Giants
- Over 8.5 (5 units)
One thing that isn't up for debate is that when these teams meet, the offense produces, as the over is now 7-2-1 in their last 10 head-to-head encounters, with a total of 36 runs scored in their last three overall meetings.
For the Diamondbacks, the over sits at 5-5 in their last 10 overall games, with exactly four runs per game allowed in that span, and for the Giants, the over comes in at 7-3 in their past 10, as they have scored a ridiculous 40 runs in their last four games played in San Francisco.
Keep it simple, take the over.
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