San Francisco Giants vs. Arizona Diamondbacks Prediction and Picks - September 15, 2025
Use Code WWWC Major League Baseball action on Monday evening, and we have a San Francisco Giants vs. Arizona Diamondbacks prediction ready to roll. The Giants are in a fight for a playoff spot, but they just lost two of three at home to the Dodgers to fall to 75-74 on the year. Arizona still has hopes of making it to the postseason as they are 75-75 on the year and just two games out of the final wildcard slot in the National League. Who will win game one of this very important series? Continue reading to see our Giants vs Diamondbacks prediction.
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Giants Take It On the Chin By The Dodgers
The Giants were overwhelmed by the Dodgers on Sunday, falling 10–2 in a game that exposed their pitching depth. Robbie Ray gave up five earned runs over four innings, and the bullpen couldn’t contain L.A.’s late surge. Wilmer Flores drove in the lone RBI, and San Francisco managed just six hits while striking out 11 times. The loss dropped them to 5–5 over their last ten and narrowed their Wild Card lead over Arizona to a half-game. They’ve hit the over in six of their last ten and are 6–4 against the spread in that span.
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Despite the setback, the Giants have shown offensive flashes. Rafael Devers leads the team with 31 home runs and 102 RBIs, ranking 12th in MLB in homers and eighth in RBIs. Jung Hoo Lee (.266 AVG) and Willy Adames (28 HR) offer support, while Matt Chapman has added 21 homers and 65 walks. The lineup ranks 19th in home runs and 22nd in slugging, but they’ve scored 5.6 runs per game over their last ten and remain dangerous in high-leverage spots. Their plate discipline has improved, with Chapman and Adames drawing consistent walks to extend innings.
Kai-Wei Teng (2–4, 7.54 ERA) takes the mound Monday, hoping to stabilize a rotation that’s been inconsistent. Teng has 28 strikeouts in 22.2 innings but has yet to record a quality start and owns a .289 opponent batting average. He gave up four earned runs over four innings in his last outing and will face a Diamondbacks lineup that ranks top five in runs and slugging. If Teng can limit walks and avoid early damage, San Francisco has the bats to keep pace—but the margin for error is thin, especially with Gallen on the other side.
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Arizona Is Staying In The Race
Arizona snapped a brief skid with a 6–4 win over Minnesota on Sunday, pulling back to .500 and keeping pace in the NL Wild Card race. James McCann led the charge with a three-run homer and an RBI single, finishing 2-for-4 with four RBIs. Nabil Crismatt delivered five strong innings, allowing no earned runs and striking out four, while the bullpen held off a late Twins rally. The win was Arizona’s third in five games, and they’ve now gone 7–3 against the spread over their last ten.
The Diamondbacks’ offense is heating up at the right time. Corbin Carroll leads the team with 30 home runs and ranks top 15 in MLB in that category, while Ketel Marte (.279 AVG, 25 HR) continues to provide veteran stability. Geraldo Perdomo enters Monday riding a five-game hit streak, batting .438 with two homers and six RBIs over that stretch. Gabriel Moreno has also surged, hitting .500 over his last five games with two home runs and a .292 season average. Arizona ranks top five in runs scored (743), slugging (.434), and home runs (203), and they’ve hit the over in six of their last ten games.
Zac Gallen (11–14, 4.84 ERA) gets the start Monday, looking to rebound after surrendering five earned runs to the Giants last week. Despite that outing, Gallen has a 3.95 ERA and 0.951 WHIP against San Francisco this season across 13.2 innings, holding their lineup to a .208 average. He’s logged 13 quality starts and has gone at least five innings in 27 straight appearances. With playoff urgency rising and the offense clicking, Arizona will lean on Gallen to set the tone at home, where he’s historically been more effective.
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San Francisco Giants vs Arizona Diamondbacks Pick
Giants vs Diamondbacks Moneyline Pick
- Arizona -140 (5 Units)
Arizona is in a strong position to take Monday’s opener, with Zac Gallen on the mound and the offense trending upward. Gallen has already held the Giants to a .208 average across two starts this season and enters with a 3.95 ERA and 0.951 WHIP against San Francisco. While his overall ERA sits at 4.84, he’s logged 13 quality starts and gone at least five innings in 27 straight outings. Backed by a lineup that ranks top five in MLB in runs, slugging, and home runs, Gallen should have the support he needs to control the pace and keep Arizona in front.
Offensively, the Diamondbacks are clicking. Geraldo Perdomo is batting .438 over his last five games with two homers and six RBIs, while Gabriel Moreno has hit .500 in that same span with two home runs and a .292 season average. Corbin Carroll and Ketel Marte round out a top-heavy lineup that’s capable of punishing mistakes, especially against Kai-Wei Teng, who enters with a 7.54 ERA and a .289 opponent batting average. Arizona has covered the run line in seven of its last ten and is 20–18 when favored by -144 or more. With playoff urgency and a favorable matchup, the Diamondbacks are well-positioned to grab the win.
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Giants vs Diamondbacks Over/Under Pick
- Over 8.5 (4 Units)
Over 8.5 is well-supported in Monday’s Giants–Diamondbacks matchup, with both teams trending toward high-scoring outcomes and vulnerable pitching. Arizona has hit the over in six of its last ten games and ranks top five in MLB in runs, slugging, and home runs, while San Francisco has averaged 5.6 runs per game over its last ten and hit the over in six of those contests. Zac Gallen has allowed five earned runs in back-to-back starts, including one against the Giants, and Kai-Wei Teng enters with a 7.54 ERA and a .289 opponent batting average. With both lineups capable of punishing mistakes and playoff pressure elevating urgency, this profiles as a 6–5 type finish that clears the number.
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