Mariners vs. Royals Prediction, Odds, Picks - September 16

Jorge Polanco and the Seattle Mariners hit the field on Tuesday at Kauffman Stadium against Michael Wacha, who is starting for the Kansas City Royals. First pitch will be at 7:40 p.m. ET. The Mariners are favored in this one, at -141, while the underdog Royals have +118 odds to upset. Seattle is the favorite on the run line (-1.5). The over/under for the contest has been set at 8.5 runs.

Check out everything you need to know from a betting perspective on the Mariners-Royals game, regarding the run line, moneyline and total, plus expert picks.

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Mariners vs. Royals Game Information & Odds

• When: Tuesday, September 16, 2025 at 7:40 p.m. ET
• Where: Kauffman Stadium in Kansas City, Missouri
• How to watch on TV: FDSKC and ROOT Sports NW

Mariners vs. Royals Prediction

• Score Prediction: Royals 5, Mariners 4
• Total Prediction: Under 8.5 runs
• Win Probabilities: Mariners 51%, Royals 49%

Mariners vs. Royals Betting Insights

• The Mariners have entered the game as favorites 105 times this season and won 60, or 57.1%, of those games.
• This season Seattle has won 36 of its 56 games, or 64.3%, when favored by at least -141 on the moneyline.
• The implied probability of a win from the Mariners, based on the moneyline, is 58.5%.
• The Royals have been underdogs in 86 games this season and have come away with the win 39 times (45.3%) in those contests.
• This season, Kansas City has come away with a win 19 times in 40 chances when named as an underdog of at least +118 or longer on the moneyline.
• The moneyline set for this matchup implies the Royals have a 45.9% chance of walking away with the win.

Mariners Recent Betting Performance

• The Mariners played eight of their last 10 games as the moneyline favorite, and won all of them.
• Over their last 10 outings (all 10 of them had set totals), the Mariners and their opponents combined to go over the run total six times.
• The Mariners have gone 7-3-0 against the spread over their past 10 games.

Mariners Recent Stats

Mariners Player Insights

• Cal Raleigh paces the Mariners with 54 home runs and 115 runs batted in.
• Among all MLB hitters, Raleigh ranks 99th in batting average, 19th in on-base percentage, and third in slugging.
• Raleigh carries a three-game hitting streak into this matchup. In his last five games he is hitting .375 with two doubles, a home run, eight walks and two RBIs.
• Julio Rodriguez is batting .269 with 30 doubles, four triples, 30 home runs and 37 walks.
• Rodriguez ranks 15th in homers and 18th in RBI among all major league hitters this season.
• Rodriguez has five straight games with at least one hit. In his last five games he is batting .400 with five doubles, three walks and four RBIs.
• Josh Naylor leads the Mariners with a .284 batting average.
• Naylor is on a two-game hitting streak entering this contest. In his last five games he is batting .318 with a home run, a walk and six RBIs.
• Eugenio Suarez has 25 doubles, 45 home runs and 44 walks while hitting .226.

Mariners Team Props

Royals Recent Betting Performance

• The Royals have played as underdogs in eight of their past 10 games and won three of those contests.
• The Royals and their opponents have combined to hit the over five times in their last 10 games with a total.
• The Royals have three wins against the spread in their last 10 chances.

Royals Recent Stats

Royals Player Insights

• Bobby Witt Jr. leads the team in batting average with a high-water mark of .292.
• Witt ranks 57th in home runs and 43rd in RBI among all hitters in MLB.
• Maikel Garcia is hitting .291 with 36 doubles, five triples, 16 home runs and 56 walks.
• Garcia is currently 113th in home runs and 71st in RBI in the big leagues.
• Vinnie Pasquantino has been a significant run producer for the Royals with 30 home runs and 104 runs batted in.
• Salvador Perez is hitting .237 with 34 doubles, 28 home runs and 23 walks.

Royals Team Props

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FOX Sports created this story using technology provided by Data Skrive and data from Sportradar.

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