Its Monday, June 30 and the Royals (39-45) are in Seattle to open a series against the Mariners (43-40).
Michael Wacha is slated to take the mound for Kansas City against George Kirby for Seattle.
Kansas City arrives in Seattle having lost seven of their last eight including two of three over the weekend to the Dodgers. After scoring but one run in last week’s series sweep at the hands of the Tampa Bay Rays, the Royals’ bats awoke scoring 14 runs in the weekend three-game series against LA but still managed just a single win.
Seattle has won two of their last three including a 6-4 win yesterday at Texas. Donovan Solano paced the attack with three hits and four RBIs as the Mariners moved to three games over .500 for the season.
Lets dive into the matchup and find a sweat or two.
We’ve got all the info and analysis you need to know ahead of the game, including the latest info on the how to catch tipoff, odds, recent team performance, player stats, and of course, our predictions, picks & best bets for the game from our modeling tools and staff of experts.
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Game details & how to watch Royals at Mariners
- Date: Monday, June 30, 2025
- Time: 9:40PM EST
- Site: T-Mobile Park
- City: Seattle, WA
- Network/Streaming: FDSNKC, RSNW
Never miss a second of the action and stay up-to-date with all the latest team stats and player news. Check out our day-by-day MLB schedule page, along with detailed matchup pages that update live in-game with every out.
Odds for the Royals at the Mariners
The latest odds as of Monday:
- Moneyline: Royals (+135), Mariners (-162)
- Spread: Mariners -1.5
- Total: 7.0 runs
Probable starting pitchers for Royals at Mariners
- Pitching matchup for June 30, 2025: Michael Wacha vs. George Kirby
- Royals: Michael Wacha (4-7, 3.33 ERA)
Last outing: 6/25 vs. Tampa Bay – 6IP, 3ER, 9H, 1BB, 9Ks - Mariners: George Kirby (1-4, 5.40 ERA)
Last outing: 6/25 at Minnesota – 6IP, 1ER, 3H, 1BB, 3Ks
- Royals: Michael Wacha (4-7, 3.33 ERA)
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Top betting trends & insights to know ahead of Royals at Mariners
- The Mariners have won their last 3 games against the Royals with George Kirby starting on the bump
- This season George Kirby has an ERA of 5.47 and a WHIP of 1.56
- Cal Raleigh was 3-10 and walked 6 times over the weekend against Texas
- Bobby Witt Jr. was 6-14 with 1 home run and 2 doubles over the weekend against the Dodgers
If you’re looking for more key trends and stats around the spread, moneyline and total for every single game on the schedule today, check out our MLB Top Trends tool on NBC Sports!
Expert picks & predictions for tonight’s game between the Royals and the Mariners
Rotoworld Best Bet
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Our model calculates projections around each moneyline, spread and over/under bet for every game on the MLB calendar based on data points like past performance, player matchups, ballpark information and weather forecasts.
Once the model is finished running, we put its projection next to the latest betting lines for the game to arrive at a relative confidence level for each wager.
Here are the best bets our model is projecting for Monday’s game between the Royals and the Mariners:
- Moneyline: NBC Sports Bet is recommending a play on the Seattle Mariners on the Moneyline.
- Spread: NBC Sports Bet is leaning towards a play ATS on the Kansas City Royals at +1.5.
- Total: NBC Sports Bet is recommending a play on the over on the Game Total of 7.0.
Want even more MLB best bets and predictions from our expert staff & tools? Check out the Expert MLB Predictions page from NBC
Follow our experts on socials to keep up with all the latest content from the staff:
- Jay Croucher (@croucherJD)
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- Vaughn Dalzell (@VmoneySports)
- Brad Thomas (@MrBradThomas)
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