Mariners vs Royals Prediction, Odds, Moneyline, Spread & Over/Under for June 30

Odds updated as of 11:11 a.m.

The Monday schedule in MLB includes a matchup between the Seattle Mariners and the Kansas City Royals.

All the info you need to make smart bets on this game at FanDuel Sportsbook can be found below. Check out all of the latest MLB betting lines here.

Mariners vs Royals Game Info

• Seattle Mariners (43-40) vs. Kansas City Royals (39-45)
• Date: Monday, June 30, 2025
• Time: 9:40 p.m. ET
• Venue: T-Mobile Park -- Seattle, Washington
• Coverage: ROOT Sports NW and FDSKC

Mariners vs Royals Odds & Moneyline

• All MLB odds, betting lines and prop bets are available on FanDuel Sportsbook.
• Moneyline: SEA: (-162) | KC: (+136)
• Spread: SEA: -1.5 (+134) | KC: +1.5 (-162)
• Total: 7.5 -- Over: (-100) | Under: (-122)

Mariners vs Royals Probable Starting Pitchers

Probable Pitchers: George Kirby (Mariners) - 1-4, 5.40 ERA vs Michael Wacha (Royals) - 4-7, 3.33 ERA

This contest's pitching matchup is set, as the Mariners will send George Kirby (1-4) to the mound, while Michael Wacha (4-7) will get the nod for the Royals. Kirby's team is 1-6-0 against the spread in his starts this season. Kirby's team is 2-3 this season when he starts and they are the moneyline favorite. The Royals have an 8-8-0 ATS record in Wacha's 16 starts that had a set spread. The Royals have a 6-4 record in Wacha's 10 starts this season when they were the moneyline underdog.

Mariners vs Royals Prediction & Pick

All MLB win probability predictions and picks are according to numberFire.
Prediction: Mariners win (56.2%)

Mariners vs Royals Moneyline

• Kansas City is the underdog, +136 on the moneyline, while Seattle is a -162 favorite at home.

Mariners vs Royals Spread

• The Royals are at the Mariners, and are +1.5 on the runline. The Royals are +134 to cover the spread, and the Mariners are -162.

Mariners vs Royals Over/Under

• A total of 7.5 runs has been set for the Mariners-Royals game on June 30, with the over available at -100 and the under at -122.

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Mariners vs Royals Betting Trends

• The Mariners have come away with 28 wins in the 51 contests they have been listed as the favorites in this season.
• This year Seattle has won seven of 14 games when listed as at least -162 on the moneyline.
• The Mariners' games have gone over the total in 44 of their 81 opportunities.
• The Mariners are 35-46-0 against the spread in their 81 games with a line set by sportsbooks this season.
• The Royals have been the underdog on the moneyline 51 total times this season. They've gone 24-27 in those games.
• In games it has played as a moneyline underdog with odds of +136 or longer, Kansas City has a record of 5-4 (55.6%).
• In the 83 games oddsmakers have set an over/under for the Royals, they have combined with opponents to go over the total 31 times (31-50-2).
• The Royals have covered 51.8% of their games this season, going 43-40-0 ATS.

Mariners Player Leaders

• Cal Raleigh leads Seattle in OBP (.388) and total hits (84) this season. He's batting .275 batting average while slugging .643.
• Among all qualifying hitters in baseball, he is 48th in batting average, eighth in on-base percentage, and second in slugging.
• Raleigh will look for his fourth straight game with a hit in this matchup. In his last five games he is batting .176 with a double and seven walks.
• Julio Rodriguez has hit 11 homers this season while driving in 42 runs. He's batting .259 this season and slugging .409 with an on-base percentage of .317.
• Among qualifying hitters, he ranks 74th in batting average, 103rd in on-base percentage and 97th in slugging percentage.
• Rodriguez brings a three-game streak with at least one hit into this contest. During his last five outings he is batting .364 with a double and an RBI.
• J.P. Crawford has 81 hits this season and has a slash line of .277/.386/.373.
• Randy Arozarena has been key for Seattle with 72 hits, an OBP of .357 plus a slugging percentage of .395.
• Arozarena heads into this game on a two-game hitting streak. In his last five games he is hitting .300 with a double, two walks and two RBIs.

Royals Player Leaders

• Bobby Witt Jr. has collected 94 hits, a team-high for the Royals. He's batting .285 and slugging .491 with an on-base percentage of .338.
• Including all the qualifying hitters in MLB, his batting average is 30th, his on-base percentage ranks 64th, and he is 28th in slugging.
• Witt takes a three-game hitting streak into this matchup. In his last five games he is batting .318 with three doubles, a home run and three RBIs.
• Maikel Garcia has a .371 OBP while slugging .485. Both lead his team. He has a batting average of .314.
• His batting average is eighth among all qualified players, his on-base percentage is 22nd, and he is 33rd in slugging.
• Vinnie Pasquantino has nine doubles, a triple, 12 home runs and 25 walks while batting .270.
• Jonathan India is hitting .246 with 16 doubles, four home runs and 30 walks.

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