• The Mariners are -155 favorites vs the Diamondbacks
• Diamondbacks vs Mariners Over / Under today: 7 Runs
• Diamondbacks / Mariners TV Channel: MRTV | DBTV | KING

The Arizona Diamondbacks (+125) visit T-Mobile Park to take on the Seattle Mariners (-155) on May 29, 2026. First pitch is scheduled for 10:10 pm in Seattle, WA.

This season, the Diamondbacks are 31-24 against the spread (ATS), while the Mariners are 22-35 ATS.

Diamondbacks vs Mariners Starting Pitchers Today:

• Diamondbacks starting pitcher: Zac Gallen 3-4, 4.81 ERA
• Mariners starting pitcher: George Kirby 5-4, 3.52 ERA

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

Diamondbacks vs Mariners Prediction for Today’s Game

Based on recent trends the model predicts the Mariners will win Friday‘s MLB game with 58.7% confidence, factoring in game simulations, recent player performances, starting pitchers and injuries.

Bet now on Diamondbacks vs Mariners and all games with BetMGM

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

Best Diamondbacks Player Prop Bets Today:

• Gabriel Moreno has hit the Home Runs Over in 2 of his last 7 games (+14.00 Units / 200% ROI)
• Ildemaro Vargas has hit the Hits Over in 20 of his last 25 away games (+13.40 Units / 30% ROI)
• Ketel Marte has hit the Total Bases Over in 16 of his last 20 games (+13.10 Units / 61% ROI)
• Adrian Del Castillo has hit the Runs Under in 21 of his last 25 games (+12.60 Units / 26% ROI)
• Corbin Carroll has hit the RBIs Under in 17 of his last 20 away games (+11.95 Units / 28% ROI)

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

Best Mariners Player Prop Best Bets Today:

• J.P. Crawford has hit the Home Runs Over in 3 of his last 7 games at home (+21.50 Units / 307% ROI)
• Cole Young has hit the Runs Under in 22 of his last 25 games (+16.45 Units / 32% ROI)
• George Kirby has hit the Walks Allowed Over in 11 of his last 15 games at home (+10.30 Units / 51% ROI)
• J.P. Crawford has hit the Walks Under in 13 of his last 15 games (+10.30 Units / 48% ROI)
• Josh Naylor has hit the Singles Over in 18 of his last 25 games (+9.45 Units / 31% ROI)

Diamondbacks Best Bets Today:

• The Arizona Diamondbacks have hit the Team Total Over in 33 of their last 50 away games (+14.05 Units / 24% ROI)
• The Arizona Diamondbacks have hit the 1st Five Innings (F5) Team Total Under in 24 of their last 35 games (+12.75 Units / 32% ROI)
• The Arizona Diamondbacks have hit the Moneyline in 14 of their last 18 games (+8.40 Units / 34% ROI)
• The Arizona Diamondbacks have hit the Game Total Over in 25 of their last 45 away games (+6.35 Units / 13% ROI)
• The Arizona Diamondbacks have hit the 1st Five Innings (F5) Moneyline in 26 of their last 50 games (+6.30 Units / 10% ROI)

Mariners Best Bets Today:

• The Seattle Mariners have hit the 1st Five Innings (F5) Team Total Under in 8 of their last 10 games at home (+6.25 Units / 48% ROI)
• The Seattle Mariners have covered the Run Line in 4 of their last 6 games (+3.80 Units / 63% ROI)
• The Seattle Mariners have covered the 1st Five Innings (F5) Run Line in 12 of their last 20 games (+3.65 Units / 16% ROI)
• The Seattle Mariners have hit the Team Total Under in 7 of their last 11 games at home (+3.40 Units / 30% ROI)
• The Seattle Mariners have hit the 1st Five Innings (F5) Moneyline in 12 of their last 20 games (+3.10 Units / 11% ROI)

Diamondbacks Against the Spread (ATS) Record

Against the spread this season, the Diamondbacks are 33-21 against the Run Line (+7.6 Units / 10.04% ROI).

• 31-24 when betting on the Moneyline for +6.55 Units / 10.05% ROI
• 27-25 when betting on the total runs Over for -0.45 Units / -0.74% ROI
• 25-27 when betting on the total runs Under for -4.5 Units / -7.46% ROI

Mariners Against the Spread (ATS) Record

Against the spread this season, the Mariners are 22-35 against the Run Line (-7.65 Units / -12.77% ROI).

• 28-29 when betting on the Moneyline for -11.25 Units / -14.21% ROI
• 26-29 when betting on the total runs Over for -5.9 Units / -9.39% ROI
• 29-26 when betting on the total runs Under for +0.4 Units / 0.64% ROI

Mariners vs Diamondbacks Home Run Prop Bets Today

Mariners vs Diamondbacks Total Hits Prop Bets Today

Mariners vs Diamondbacks Strikeout Prop Bets Today

Diamondbacks Keys to the Game vs. the Mariners

The Diamondbacks are 5-15 (.250) when trailing entering the 7th inning this season — 2nd best in MLB; League Avg: .135.

The Diamondbacks are just 84-22 (.792) when leading entering the 7th inning since the 2025 season — 3rd lowest in MLB; League Avg: .873.

The Diamondbacks are just 93-16 (.853) when leading entering the 8th inning since the 2025 season — 2nd lowest in MLB; League Avg: .907.

The Diamondbacks are 7-84 (.077) when trailing entering the 9th inning since the 2025 season — 3rd best in MLB; League Avg: .045.

Mariners Keys to the Game vs. the Diamondbacks

The Mariners are 9-4 (.692) vs top 10 scoring offenses this season Today, they face the Diamondbacks (10th in runs scored).

The Mariners are 25-15 (.625) when tied entering the 7th inning since the 2025 season — 4th best in MLB; League Avg: .500.

The Mariners are 6-84 (.067) when trailing entering the 9th inning since the 2025 season — 4th best in MLB; League Avg: .045.

The Mariners were 18-10 (.643) when tied entering the 7th inning in the 2025 season — 4th best in MLB; League Avg: .500.

Diamondbacks Hitting Stats & Trends

Diamondbacks hitters have struck out in just 17% of their PA’s against LHP this season — best in MLB.

Diamondbacks hitters have a swing rate of just 25% on the first pitch of at-bats this season — lowest in MLB.

The Diamondbacks are batting .343 in lefty-lefty matchups this season — best in MLB.

The Diamondbacks are batting .281 against LHP this season — best in MLB.

Mariners Hitting Stats & Trends

Mariners hitters have an OPS of just .615 (657 PA’s) against LHP this season — 3rd lowest in MLB.

The Mariners are batting just .204 against LHP this season — lowest in MLB.

The Mariners are batting just .170 against left-handed relievers this season — lowest in MLB.

Mariners hitters have an OBP of just .285 (657 PA’s) against LHP this season — tied for 2nd lowest in MLB.

Diamondbacks Pitching Stats & Trends

Opponents have a miss rate of just 23% against Diamondbacks pitchers this season — 2nd lowest in MLB.

Diamondbacks pitchers have a strikeout rate of just 19% this season — 2nd lowest in MLB.

Diamondbacks pitchers have a strikeout rate of just 19% in the first 5 innings this season — 3rd lowest in MLB.

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

Mariners Pitching Stats & Trends

Mariners pitchers have a first-pitch strike rate of 67% this season — highest in MLB.

Mariners pitchers have walked 7% of batters this season — best in MLB.

Mariners pitchers have thrown at least two strikes in their first three pitches to 70% of opposing batters this season — highest in MLB.

Mariners pitchers have an ERA of 3.54 (506.1 IP) this season — 5th best in MLB.

More MLB Reading:

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

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