The Kansas City Royals will look for a road series sweep on Sunday when they face the Seattle Mariners.
Cal Raleigh is day-to-day after being scratched before Saturday’s game, but MLB odds still have them favored regardless of his status.
My Royals vs. Mariners predictions have MLB picks for the side and total for their game on Sunday, May 3.
Who will win Royals vs Mariners today: Royals moneyline (+105)
Seattle Mariners right-hander Luis Castillo has been getting rocked, ranking in the Bottom 10% in average exit velocity.
That’s going to happen when your sinker loses 1.4 inches of both vertical break and drop. Add in command issues, and opponents posting an xBA of .299 and a .423 xwOBAcon, and it's been ugly for the veteran hurler.
The Kansas City Royals rank eighth in ISO and fourth in wRC+ over the past two weeks. I expect them to get some early runs against Castillo.
Kris Bubic is doing a good job of avoiding hard contact (75th percentile) and will help the Royals win their seventh game in nine outings.
COVERS INTEL: Castillo is allowing a 30.5% line-drive rate, compared to an average of 22.6% over the past two seasons.
Royals vs Mariners Over/Under pick: Over 7.5 (-128)
Both teams are swinging with power, each ranking in the Top 10 in ISO over the past two weeks, and in the Top 5 in wRC+.
While yesterday’s pitching matchup was conducive to a lower score, this one isn’t.
Bubic isn’t immune to issues, given his 0.80 HR/9 rate and a barrel rate of 9.5%, which has led to a .408 xSLG.
As long as this number stays below a flat 8.0, I like the Over, which is 14-8 in Seattle’s last 22 home games.
- ML/RL bets: 2-5, -3.5 units
- Over/Under bets: 5-2, +2.91 units
Royals vs Mariners odds
- Moneyline: Royals +108 | Mariners -113
- Run line: Royals -1.5 (+186) | Mariners +1.5 (-194)
- Over/Under: Over 7.5 (-117) | Under 7.5 (+108)
Royals vs Mariners trend
The Kansas City Royals have hit the Moneyline in 6 of their last 8 games (+4.35 Units / 50% ROI). Find more MLB betting trends for Royals vs. Mariners.
How to watch Royals vs Mariners and game info
| Location | T-Mobile Park, Seattle, WA |
| Date | Sunday, May 3, 2026 |
| First pitch | 4:10 p.m. ET |
| TV | Mariners.TV, Royals.TV |
| Royals starting pitcher | Kris Bubic (2-1, 3.74 ERA) |
| Mariners starting pitcher | Luis Castillo (0-2, 6.35 ERA) |
Royals vs Mariners latest injuries
Royals vs Mariners weather
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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