• The Mariners are -135 favorites vs the Royals
• Mariners vs Royals Over / Under today: 8 Runs
• Mariners / Royals TV Channel: RYTV | KCTV | MRTV

The Seattle Mariners (-135) visit Kauffman Stadium to take on the Kansas City Royals (+110) on May 22, 2026. First pitch is scheduled for 7:40 pm in Kansas City, MO.

This season, the Mariners are 24-27 against the spread (ATS), while the Royals are 20-28 ATS.

Mariners vs Royals Starting Pitchers Today:

• Mariners starting pitcher: Logan Gilbert 2-4, 4.43 ERA
• Royals starting pitcher: Noah Cameron 2-3, 5.36 ERA

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

Mariners vs Royals Prediction for Today’s Game

Based on recent trends the model predicts the Mariners will win Friday‘s MLB game with 58.4% confidence, factoring in game simulations, recent player performances, starting pitchers and injuries.

Bet now on Mariners vs Royals and all games with BetMGM

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

Best Mariners Player Prop Bets Today:

• Cole Young has hit the Runs Under in 19 of his last 20 games (+16.75 Units / 40% ROI)
• Rob Refsnyder has hit the Total Bases Under in 15 of his last 20 games (+11.40 Units / 50% ROI)
• Randy Arozarena has hit the Hits Over in 20 of his last 25 away games (+10.80 Units / 24% ROI)
• Randy Arozarena has hit the Singles Over in 17 of his last 25 away games (+10.50 Units / 40% ROI)
• Mitch Garver has hit the Walks Over in 8 of his last 10 games (+9.25 Units / 92% ROI)

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

Best Royals Player Prop Best Bets Today:

• Michael Massey has hit the Home Runs Over in 3 of his last 10 games at home (+18.50 Units / 185% ROI)
• Carter Jensen has hit the Total Bases Under in 16 of his last 20 games (+12.65 Units / 45% ROI)
• Isaac Collins has hit the Runs Under in 17 of his last 20 games (+11.25 Units / 29% ROI)
• Vinnie Pasquantino has hit the Hits Under in 12 of his last 20 games at home (+10.85 Units / 51% ROI)
• Vinnie Pasquantino has hit the Singles Under in 18 of his last 25 games at home (+9.00 Units / 28% ROI)

Mariners Best Bets Today:

• The Seattle Mariners have hit the Team Total Under in 16 of their last 24 away games (+6.55 Units / 23% ROI)
• The Seattle Mariners have hit the 1st Five Innings (F5) Team Total Under in 15 of their last 23 games (+6.30 Units / 22% ROI)
• The Seattle Mariners have hit the Game Total Under in 14 of their last 23 away games (+5.40 Units / 22% ROI)
• The Seattle Mariners have covered the 1st Five Innings (F5) Run Line in their last 5 away games (+5.05 Units / 83% ROI)
• The Seattle Mariners have hit the 1st Five Innings (F5) Moneyline in their last 5 away games (+5.00 Units / 67% ROI)

Royals Best Bets Today:

• The Kansas City Royals have hit the 1st Five Innings (F5) Team Total Under in 32 of their last 50 games (+12.05 Units / 20% ROI)
• The Kansas City Royals have hit the Team Total Under in their last 7 games (+7.00 Units / 79% ROI)
• The Kansas City Royals have hit the 1st Five Innings (F5) Moneyline in 11 of their last 19 games at home (+5.85 Units / 22% ROI)
• The Kansas City Royals have covered the 1st Five Innings (F5) Run Line in 12 of their last 19 games at home (+4.60 Units / 21% ROI)
• The Kansas City Royals have hit the Game Total Over in 11 of their last 17 games at home (+4.45 Units / 24% ROI)

Mariners Against the Spread (ATS) Record

Against the spread this season, the Mariners are 18-33 against the Run Line (-11.45 Units / -21.24% ROI).

• 24-27 when betting on the Moneyline for -12.75 Units / -17.66% ROI
• 23-26 when betting on the total runs Over for -5.75 Units / -10.2% ROI
• 26-23 when betting on the total runs Under for +0.7 Units / 1.25% ROI

Royals Against the Spread (ATS) Record

Against the spread this season, the Royals are 20-28 against the Run Line (-12.2 Units / -18.33% ROI).

• 20-30 when betting on the Moneyline for -14.65 Units / -24.44% ROI
• 22-28 when betting on the total runs Over for -8.55 Units / -15.6% ROI
• 28-22 when betting on the total runs Under for +3.85 Units / 6.97% ROI

Royals vs Mariners Home Run Prop Bets Today

Royals vs Mariners Total Hits Prop Bets Today

Royals vs Mariners Strikeout Prop Bets Today

Mariners Keys to the Game vs. the Royals

The Mariners are just 2-12 (.143) vs bottom 10 scoring offenses this season Today, they face the Royals (28th in runs scored).

The Mariners are just 6-23 (.207) when scoring 4 or fewer runs this season — 5th lowest in MLB; League Avg: .279.

The Mariners are just 18-4 (.818) when leading entering the 8th inning this season — 5th lowest in MLB; League Avg: .894.

The Mariners are 24-15 (.615) when tied entering the 7th inning since the 2025 season — 5th best in MLB; League Avg: .500.

Royals Keys to the Game vs. the Mariners

The Royals are just 15-4 (.789) when leading entering the 8th inning this season — tied for 2nd lowest in MLB; League Avg: .894.

The Royals are just 3-11 (.214) when their opponents score in the first inning this season — 2nd lowest in MLB; League Avg: .364.

The Royals are just 1-14 (.067) when allowing 10 or more hits this season — 2nd lowest in MLB; League Avg: .245.

The Royals are just 9-20 (.310) after a loss this season — 2nd lowest in MLB; League Avg: .475.

Mariners Hitting Stats & Trends

The Mariners are batting just .189 against LHP this season — lowest in MLB.

Mariners hitters have put just 31% of their swings in play with runners in scoring position this season — lowest in MLB.

Mariners hitters have an OBP of just .277 (568 PA’s) against LHP this season — tied for lowest in MLB.

The Mariners are batting just .220 with runners on base this season — 2nd lowest in MLB.

Royals Hitting Stats & Trends

Royals hitters are slugging just .338 on the road this season — lowest in MLB.

Royals hitters have an OPS of just .435 (965 PA’s) with two-strikes this season — lowest in MLB.

Royals hitters are slugging just .208 with two-strikes this season — lowest in MLB.

Royals hitters are slugging just .162 on pitches out of the zone this season — tied for 2nd lowest 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 6% of batters when facing the leadoff batter in the inning this season — 2nd best in MLB.

Opponents have a swing rate of 51% against the Mariners pitchers this season — highest 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.

Royals Pitching Stats & Trends

Royals pitchers have walked 11% of batters this season — 4th highest in MLB.

Royals pitchers have a strikeout rate of just 19% in close and late situations this season — 4th lowest in MLB.

Royals pitchers have picked-off 9 runners from first base this season — most in MLB.

Royals pitchers have allowed three-ball counts to 24% of batters they faced (447/1,889 PA’s) this season — 2nd 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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