Giants vs. Diamondbacks Prediction, Odds, Probable Pitchers and Prop Bets for Tuesday, July 1

Iain MacMillan | Jul 1, 2025

The Diamondbacks are home favorites against the Giants on Tuesday night. / Patrick Gorski-Imagn Images

The National League West is likely out of the picture for the San Francisco Giants and Arizona Diamondbacks at this point in the season, but a wild card berth is well within reach. That makes this week's divisional series between the Giants and Diamondbacks a big one.

The Diamondbacks are 3-1 against the Giants so far this season, including beating them by a score of 4-2 on Monday night. Will they capture another win against them tonight? Let's find out what the oddsmakers think.

Giants vs. Diamondbacks Odds, Run Line, and Total

Odds via DraftKings Sportsbook

Run Line

• Giants +1.5 (-182)
• Diamondbacks -1.5 (+148)

Moneyline

• Giants +112
• Diamondbacks -137

Total

• Over 9 (-121)
• Under 9 (-101)

Giants vs. Diamondbacks Probable Pitchers

• San Francisco: Hayden Birdsong, RHP (3-2, 4.13 ERA)
• Arizona: Zac Gallen, RHP (5-9, 5.75 ERA)

Giants vs. Diamondbacks Best MLB Prop Bet

Pick: Zac Gallen OVER 2.5 Walks Allowed (+135)

In today's Painting Corners, I broke down why I'm betting a big plus-money wager on Zac Gallen of the Diamondbacks:

No team has drawn more walks since the start of June than the San Francisco Giants. They have drawn a walk on 10.5% of their plate appearances, 0.6% higher than the next highest walk rate in that time frame. Tonight, they'll face Zac Gallen of the Diamondbacks, who has walked 3+ batters in four of his last seven starts.

At plus-money, we can bet on the Giants to draw three walks by Gallen at +135, which, based on his recent history, seems like a great bet to me.

Giants vs. Diamondbacks Prediction and Pick

There's no denying the Diamondbacks have the better offense, consistently ranking in the top 5 or top 10 in virtually every single offensive metric. Unfortunately, their pitching continues to let them down.

Tonight, Zac Gallen gets the start for them, and he's had a rough 2025 campaign, going 5-9 with a 5.75 ERA in 17 starts this season. Even if he survives his start, the Diamondbacks will eventually have to turn to their bullpen, which has a 5.27 ERA on the season, the fourth-highest amongst all teams.

Then there are the Giants, who will start Hayden Birdsong (4.13 ERA) and then eventually get to turn to their top-ranked bullpen (2.93 ERA). As long as the Giants can put up a few runs, their pitching will carry them the rest of the way tonight.

Pick: Giants +112 via DraftKings

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