• The Diamondbacks are -145 favorites vs the Giants
• Giants vs Diamondbacks Over / Under today: 9 Runs
• Giants / Diamondbacks TV Channel: NSBA | DBTV

The San Francisco Giants (+118) visit Chase Field to take on the Arizona Diamondbacks (-145) on May 18, 2026. First pitch is scheduled for 9:40 pm in Phoenix, AZ.

This season, the Giants are 20-27 against the spread (ATS), while the Diamondbacks are 27-17 ATS.

Giants vs Diamondbacks Starting Pitchers Today:

• Giants starting pitcher: Robbie Ray 3-5, 3.06 ERA
• Diamondbacks starting pitcher: Zac Gallen 1-4, 5.03 ERA

Giants vs. Diamondbacks Odds, Run Line, Over/Under & Moneyline

Giants vs Diamondbacks Prediction for Today’s Game

Based on recent trends the model predicts the Diamondbacks will win Monday‘s MLB game with 57.1% confidence, factoring in game simulations, recent player performances, starting pitchers and injuries.

Bet now on Giants vs Diamondbacks and all games with BetMGM

We’ve highlighted some favorite MLB player prop bets for Giants players for Monday‘s game, looking at profitable historical betting trends:

Best Giants Player Prop Bets Today:

• Luis Arraez has hit the Home Runs Over in 2 of his last 4 games (+21.00 Units / 525% ROI)
• Matt Chapman has hit the Runs Under in 14 of his last 15 games (+12.30 Units / 44% ROI)
• Harrison Bader has hit the Total Bases Over in 18 of his last 25 away games (+12.05 Units / 36% ROI)
• Matt Chapman has hit the Walks Under in 20 of his last 25 away games (+11.25 Units / 25% ROI)
• Harrison Bader has hit the Hits Over in 19 of his last 25 away games (+9.85 Units / 24% ROI)

And here are some favorite MLB player prop bets for Diamondbacks players for Monday‘s game, looking at profitable historical betting trends:

Best Diamondbacks Player Prop Best Bets Today:

• Jose Fernandez has hit the Singles Over in 18 of his last 25 games (+11.45 Units / 42% ROI)
• Corbin Carroll has hit the Hits Under in 13 of his last 20 games at home (+11.05 Units / 43% ROI)
• Ketel Marte has hit the RBIs Under in 20 of his last 25 games (+10.55 Units / 22% ROI)
• Lourdes Gurriel Jr. has hit the Total Bases Under in 18 of his last 25 games at home (+9.10 Units / 25% ROI)
• Ketel Marte has hit the Runs Under in 14 of his last 20 games (+8.90 Units / 36% ROI)

Giants Best Bets Today:

• The San Francisco Giants have hit the Team Total Under in 22 of their last 35 away games (+7.30 Units / 18% ROI)
• The San Francisco Giants have hit the Game Total Under in 10 of their last 14 away games (+5.60 Units / 36% ROI)
• The San Francisco Giants have hit the Moneyline in 5 of their last 8 games (+4.65 Units / 56% ROI)
• The San Francisco Giants have hit the 1st Five Innings (F5) Team Total Under in 23 of their last 40 games (+3.55 Units / 8% ROI)
• The San Francisco Giants have hit the 1st Five Innings (F5) Moneyline in 3 of their last 6 games (+2.50 Units / 42% ROI)

Diamondbacks Best Bets Today:

• The Arizona Diamondbacks have hit the 1st Five Innings (F5) Team Total Under in 27 of their last 35 games at home (+17.75 Units / 41% ROI)
• The Arizona Diamondbacks have hit the 1st Five Innings (F5) Moneyline in 27 of their last 50 games at home (+11.30 Units / 17% ROI)
• The Arizona Diamondbacks have hit the Moneyline in 28 of their last 45 games at home (+9.40 Units / 17% ROI)
• The Arizona Diamondbacks have covered the Run Line in 22 of their last 35 games at home (+7.80 Units / 17% ROI)
• The Arizona Diamondbacks have hit the Team Total Over in 22 of their last 35 games (+7.55 Units / 18% ROI)

Giants Against the Spread (ATS) Record

Against the spread this season, the Giants are 20-26 against the Run Line (-15.4 Units / -22.87% ROI).

• 20-27 when betting on the Moneyline for -4.45 Units / -8.78% ROI
• 20-24 when betting on the total runs Over for -6.35 Units / -12.25% ROI
• 24-20 when betting on the total runs Under for +2.1 Units / 4.07% ROI

Diamondbacks Against the Spread (ATS) Record

Against the spread this season, the Diamondbacks are 27-17 against the Run Line (+4.4 Units / 6.86% ROI).

• 22-23 when betting on the Moneyline for -0.35 Units / -0.7% ROI
• 23-20 when betting on the total runs Over for +1.1 Units / 2.21% ROI
• 20-23 when betting on the total runs Under for -5.1 Units / -10.32% ROI

Diamondbacks vs Giants Home Run Prop Bets Today

Diamondbacks vs Giants Total Hits Prop Bets Today

Diamondbacks vs Giants Strikeout Prop Bets Today

Giants Keys to the Game vs. the Diamondbacks

The Giants are just 0-21 (.000) when trailing entering the 7th inning this season — tied for lowest in MLB; League Avg: .134.

The Giants are just 0-23 (.000) when trailing entering the 8th inning this season — tied for lowest in MLB; League Avg: .105.

The Giants are just 4-5 (.444) vs the bottom 10 runs allowed teams this season Today, they face the Diamondbacks (23rd runs allowed).

The Giants are just 14-4 (.778) when leading entering the 7th inning this season — 4th lowest in MLB; League Avg: .866.

Diamondbacks Keys to the Game vs. the Giants

The Diamondbacks are 4-15 (.211) when trailing entering the 7th inning this season — tied for 5th best in MLB; League Avg: .134.

The Diamondbacks are just 0-19 (.000) when trailing entering the 9th inning this season — tied for lowest in MLB; League Avg: .051.

The Diamondbacks are just 2-11 (.154) when allowing 2 or more home runs this season — 3rd lowest in MLB; League Avg: .295.

The Diamondbacks are just 77-21 (.786) when leading entering the 7th inning since the 2025 season — 2nd lowest in MLB; League Avg: .873.

Giants Hitting Stats & Trends

The Giants have an average HR distance of 375.5 feet this season — lowest in MLB.

Giants hitters have drawn walks in 6% of their PA’s against RHP this season — lowest in MLB.

34% of Giants hitters strikeouts have come on 95+ MPH fastballs this season — highest in MLB.

Giants hitters have an OBP of just .293 (1,735 PA’s) this season — lowest in MLB.

Diamondbacks Hitting Stats & Trends

Diamondbacks hitters have an OPS of just .680 (1,156 PA’s) against RHP this season — 5th lowest in MLB.

9% of Diamondbacks’ hitters plate appearances have lasted only one pitch (144/1,665 PA’s) this season — 2nd lowest in MLB.

Diamondbacks hitters have a swing rate of just 24% on the first pitch of at-bats this season — lowest in MLB.

Diamondbacks hitters are slugging just .259 on breaking pitches against RHP this season — lowest in MLB.

Giants Pitching Stats & Trends

Giants pitchers have thrown at least two strikes in their first three pitches to 56% of opposing batters this season — lowest in MLB.

Giants pitchers have induced opposing hitters to ground into 44 double plays in 338 opportunities (13%) this season — best in MLB.

Opponents have a groundball rate of 47% against Giants pitchers this season — 3rd highest in MLB.

Opponents have a groundball batting average of just .211 against Giants pitchers this season — best in MLB.

Diamondbacks Pitching Stats & Trends

Diamondbacks pitchers have walked 6% of batters when facing the leadoff batter in the inning this season — 2nd best in MLB.

Diamondbacks pitchers have a strikeout rate of just 18% with runners in scoring position this season — 2nd lowest in MLB.

Diamondbacks pitchers have a strikeout rate of just 20% this season — tied for 5th lowest in MLB.

Diamondbacks pitchers have allowed an average Exit Velocity of 89.7 MPH (1,127 batted balls) this season — tied for 5th highest in MLB.

More MLB Reading:

• Home Run Predictions Today
• Best NRFI Bets Today
• Strikeout Props Today
• MLB Starting Pitchers Today

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