The Kansas City Royals host the Seattle Mariners on May 24, 2026. First pitch from Kauffman Stadium is scheduled for 2:10 p.m. EDT. The game will be broadcast on SEAM.
The Mariners are favored by -138 on the moneyline and by -1.5 on the run line. The Royals are +118 on the moneyline and +1.5 on the run line. The total is set at 8.5 runs.
Find my MLB picks and Mariners vs Royals prediction below, as well as probable pitchers, weather report, and more.
Mariners vs Royals Prediction
- Mariners vs Royals Pick: Mariners ML (-150 or Better)
My Mariners vs Royals best bet is on Seattle to win. Make sure to find the best odds by checking our live MLB odds page.
Mariners vs Royals Odds
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +122 | 8.5 -115o / -105u | -138 |
| Royals Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -146 | 8.5 -115o / -105u | +118 |
- Mariners vs Royals moneyline: Mariners -138, Royals +118
- Mariners vs Royals over/under: 8.5 (-115 / -105)
- Mariners vs Royals spread: Mariners -1.5 (+122), Royals +1.5 (-146)
Mariners vs Royals Probable Pitchers
| Bryan Woo (RHP, SEA) | Stat | Seth Lugo (RHP, KCR) |
|---|---|---|
| 4-2 | W-L | 1-4 |
| 1.4 | fWAR (FanGraphs) | 1.6 |
| 3.51 / 3.16 | ERA / xERA | 3.68 / 4.92 |
| 3.27 / 3.94 | FIP / xFIP | 2.88 / 4.01 |
| 18.5% | K-BB% | 12.2% |
| 31.1% | GB% | 36.3% |
| .253 | BABIP | .343 |
| 110 | Stuff+ | 87 |
| 107 | Location+ | 106 |
Mariners vs Royals MLB Betting Preview
The Royals are set to host Seattle to conclude their three-game homestand with the Mariners at Kauffman Stadium in Kansas City.
36-year-old veteran right-hander Seth Lugo will take the mound for the Royals, while the Mariners will be sending out an elite young arm in Bryan Woo, who is coming off a phenomenal 2025 campaign, having pitched in last year’s All-Star Game for the American League.
Woo has undoubtedly been one of the most consistent starting pitchers in all of baseball over the past two seasons, with Seattle’s righty having recorded both a sub-3 ERA and sub-1 WHIP in 2024 and then 2025.
While the 26-year-old’s ERA has taken a slight hike up to 3.51 thus far in 2026, Woo’s 0.98 WHIP still ranks inside the top-10 in the entire MLB.
That said, Woo’s increased ERA this season is mostly due to two outlier performances, of which the Mariners’ right-hander collectively allowed 13 earned runs (ER) across 19 frames in consecutive outings.
In just that two-start span, Woo allowed an insane six homers and has not allowed a single other ball to leave the yard in any of his other eight outings in 2026. In short, Seattle’s starter has elite stuff and is borderline unhittable when in top form.
Though his periodic volatility is definitely something to monitor for the remainder of the season. On the other hand, Royals righty Seth Lugo is trending downward after a phenomenal start to his 11th season playing in the Big Leagues.
After having allowed just four ER throughout his first five starts of the season across 30 frames on the mound, Lugo allowed 14 hits and seven ER in his sixth outing and has had difficulty finding the early-season form that resulted in his top-five ERA mark over the first few weeks of the 2026 season.
Lugo’s ERA has dropped rather significantly from right around 2.00 to 3.68 due to several poor starts on the bump, and I am most definitely concerned about his form for the remainder of the season, given his age and apparent rapid decline.
Mariners vs Royals Pick, Betting Analysis
The Mariners have a clear pitching edge in Sunday afternoon’s matchup and a far stronger lineup, given the Royals’ offensive struggles at the plate aside from the production from their star shortstop, Bobby Witt Jr.
The rest of the Royals’ core, featuring the likes of Vinnie Pasquantino, Sal Perez, and Maikel Garcia, amongst a few others, is having a very difficult time finding a rhythm in the box over the first two months of the season.
I think this is a great spot to back the M’s, who should have some value on the moneyline with Sunday’s contest being played in Kansas City.
Pick: Mariners ML (-150 or Better)
