Mariners vs. Royals odds, tips and betting trends

The Seattle Mariners (82-68) will visit the Kansas City Royals (75-75), Tuesday at 7:40 p.m. ET, in the opener of a three-game series.

The Mariners are favored (-136 on the moneyline to win) when they square off against the Royals (+114). The Seattle Mariners will hand the ball to Logan Gilbert (4-6, 3.54 ERA), who is looking for win No. 5 on the season, and the Royals will turn to Michael Wacha (9-11, 3.45 ERA).

The Mariners defeated the Angels by an 11-2 score in their last game Sunday. Cal Raleigh went 2 for 4 with a home run and two RBIs to lead them offensively while George Kirby earned the win after throwing 6 1/3 innings, giving up two earned runs on three hits while striking out 14.

The Royals knocked off the Phillies 10-3 Sunday. Salvador Perez went 2 for 5 with a home run and five RBIs, and Noah Cameron got the win, pitching seven innings, giving up two earned runs on four hits while striking out seven.

Before watching this Mariners vs. Royals matchup, here’s what you need to know about Tuesday’s action on the diamond, including viewing options.

Seattle Mariners vs. Kansas City Royals odds, line and spread

MLB odds courtesy of BetMGM Sportsbook. Odds updated Monday at 9:16 p.m. ET. For a full list of sports betting odds, access USA TODAY Sports Betting Scores Odds Hub.

Favorite: Mariners (-136, bet $136 to win $100)
Underdog: Royals (+114, bet $100 to win $114)
Over/under: 8.5

Mariners vs. Royals: Game time and live stream info

Game day: Tuesday, September 16, 2025
Game time: 7:40 p.m. ET
Location: Kansas City, Missouri
Stadium: Kauffman Stadium
TV channel: FDSKC and ROOT Sports NW
Live stream: Watch LIVE with Fubo! (Regional restrictions may apply)

Watch Mariners vs. Royals on Fubo!

Mariners stats and trends

Mariners betting records

This season, the Mariners have been favored 105 times and won 60, or 57.1%, of those games.
Seattle has a record of 38-23 in games when bookmakers favor them by at least -136 on the moneyline.
Bookmakers have implied with the moneyline set for this matchup that the Mariners have a 57.6% chance to win.
Seattle and its opponents have hit the over in 81 of its 150 games with a total this season.
In 150 games with a spread this season, the Mariners are 63-87-0 ATS.

Logan Gilbert (Mariners probable starter)

The Mariners are sending Gilbert (4-6) out for his 23rd start of the season. He is 4-6 with a 3.54 ERA and 159 strikeouts through 114 1/3 innings pitched.
The right-hander last pitched on Thursday against the St. Louis Cardinals, when he went 4 2/3 innings, allowing one earned run while giving up five hits.
The 28-year-old has an ERA of 3.54, with 12.5 strikeouts per nine innings, in 22 games this season. Opponents are batting .209 against him.
Gilbert has seven quality starts under his belt this year.
Gilbert is trying to secure his 18th start of five or more innings this year in this matchup.
In three of his appearances this season he did not surrender an earned run.
He will take the mound against a Royals offense that ranks 20th in MLB with 1219 total hits (on a .244 batting average). The squad also slugs a collective .391 (19th in MLB) with 144 total home runs (25th in MLB).
Gilbert has a 1.93 ERA and a 1.286 WHIP against the Royals this season in 4 2/3 innings pitched, allowing a .188 batting average over one appearance.

Mariners batting stats

The Mariners have hit 216 homers this season, which ranks third in the league.
Fueled by 439 extra-base hits, Seattle ranks 11th in MLB with a .416 slugging percentage this season.
The Mariners rank 20th in MLB with a .243 team batting average.
Seattle has scored the 10th-most runs in the majors this season with 705.
The Mariners have an OBP of .320 this season, which ranks 11th in MLB.
Seattle ranks just 27th in MLB in strikeouts per game with an average of 8.9 whiffs per contest.

Royals stats and trends

Royals betting records

The Royals have been chosen as underdogs in 86 games this year and have walked away with the win 39 times (45.3%) in those games.
Kansas City has a mark of 21-26 in contests where oddsmakers favor it by +114 or worse on the moneyline.
The moneyline set for this matchup implies the Royals have a 46.7% chance of coming away with a victory in the contest.
Contests with Kansas City has gone over the total set by bookmakers in 64 of 150 chances this season.
The Royals are 74-76-0 against the spread in their 150 games with a line set by sportsbooks this season.

Michael Wacha (Royals probable starter)

Wacha (9-11) is looking for his 10th win when he gets the starting nod for the Royals in his 29th start of the season. He has a 3.45 ERA in 159 2/3 innings pitched, with 117 strikeouts.
The right-hander last pitched on Friday, Sept. 5 against the Minnesota Twins, when he went 5 2/3 innings, allowing one earned run while giving up four hits.
The 34-year-old has an ERA of 3.45, with 6.6 strikeouts per nine innings in 28 games this season. Opposing hitters have a .245 batting average against him.
Wacha heads into this game with 12 quality starts under his belt this year.
Wacha will try to secure his 26th matchup of five or more innings pitched this season. He averages 5.7 innings per appearance.
In three of his 28 total appearances this season he has not surrendered an earned run.
He will match up with a Mariners offense that ranks 16th in the league with 1241 total hits (on a .243 batting average). The team also slugs a collective .416 (11th in the league) with 216 total home runs (third in MLB action).
Wacha has a 9.00 ERA and a 2.000 WHIP against the Mariners this season in five innings pitched, allowing a .381 batting average over one appearance.
The 34-year-old ranks 21st in ERA (3.45), 20th in WHIP (1.182), and 47th in K/9 (6.6) among qualifying pitchers in MLB play this season.

Royals batting stats

The Royals rank 25th in MLB play with 144 total home runs.
This season, Kansas City’s .391 slugging percentage ranks 19th in the majors.
The Royals are 18th in MLB with a .244 batting average.
Kansas City is the third-lowest scoring team in MLB action averaging 3.8 runs per game (577 total).
The Royals’ .305 on-base percentage ranks 25th in the majors.

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