Mariners vs. Royals Prediction, Odds, Picks - September 18

The Seattle Mariners versus Kansas City Royals game on Thursday at 2:10 p.m. ET will feature a pair of hot hitters in Cal Raleigh and Bobby Witt Jr. The Mariners are -121 moneyline favorites for this matchup with the Royals (+101). Seattle is a 1.5-run favorite (at +131 odds). The total is 9 runs for the game (with -120 odds on the over and -100 odds on the under).

Here's 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 Highlights | MLB on FOX

Check out the best moments between the Seattle Mariners vs. Kansas City Royals.

Mariners vs. Royals Game Information & Odds

• When: Thursday, September 18, 2025 at 2:10 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 9 runs
• Win Probabilities: Mariners 51%, Royals 49%

Mariners vs. Royals Betting Insights

• This season, the Mariners have been favored 106 times and won 61, or 57.5%, of those games.
• Seattle has a record of 52-35 in games when bookmakers favor them by at least -121 on the moneyline.
• The oddsmakers' moneyline implies a 54.8% chance of a victory for the Mariners.
• The Royals have won in 39, or 44.8%, of the 87 contests they have been named as odds-on underdogs this year.
• Kansas City has a mark of 27-44 in contests where oddsmakers favor it by +101 or worse on the moneyline.
• The moneyline set for this matchup implies the Royals have a 49.8% chance of coming away with a victory in the contest.

Mariners Recent Betting Performance

• The Mariners won each of the nine games it played as a moneyline favorite in their last 10 matchups.
• In their last 10 matchups -- all had a set run total -- the Mariners and their opponents combined to hit the over on the total seven times.
• The Mariners are 7-3-0 against the spread over their past 10 games.

Mariners Recent Stats

Mariners Player Insights

• Raleigh paces the Mariners with 56 home runs and 118 runs batted in.
• Among all hitters in baseball, Raleigh ranks first in home runs and third in RBI.
• Raleigh takes a hitting streak of five games into this game. During his last five outings he is hitting .474 with three doubles, three home runs, two walks and five RBIs.
• Julio Rodriguez is hitting .271 with 31 doubles, four triples, 30 home runs and 38 walks.
• Among all major league hitters, Rodriguez is 16th in home runs and 18th in RBI.
• Rodriguez carries a seven-game streak with at least one hit into this matchup. In his last 10 games he is hitting .350 with seven doubles, four walks and seven RBIs.
• Josh Naylor paces the Mariners with a .285 batting average.
• Naylor is on a four-game hitting streak entering this contest. During his last five outings he is hitting .273 with a double and six RBIs.
• Eugenio Suarez has 26 doubles, 46 home runs and 44 walks while hitting .230.

Mariners Team Props

Royals Recent Betting Performance

• In eight games as underdogs over the last 10 matchups, the Royals have a record of 2-6.
• The Royals and their opponents have combined to hit the over six 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

• Witt leads the Royals with a team-leading batting average of .293.
• Among all batters in MLB, Witt's home run total ranks 59th and his RBI tally ranks 40th.
• Witt brings a hitting streak of three games into this game. During his last five outings he is batting .300 with a double, a triple, a home run, two walks and three RBIs.
• Maikel Garcia is batting .289 with 36 doubles, five triples, 16 home runs and 57 walks.
• Garcia is 117th in home runs and 76th in RBI among all MLB hitters this year.
• Vinnie Pasquantino has been solid source of run production for the Royals with 30 long balls and 104 runs batted in.
• Salvador Perez is batting .238 with 34 doubles, 29 home runs and 25 walks.

Royals Team Props

Mariners vs. Royals Highlights | MLB on FOX

Check out the best moments between the Seattle Mariners vs. Kansas City Royals.

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

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