Kansas City Royals at Seattle Mariners odds, picks and predictions

Analyzing Monday’s Kansas City Royals at Seattle Mariners odds and lines, with MLB expert picks, predictions and best bets.

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The Kansas City Royals (25-17) and Seattle Mariners (22-19) open a 3-game series Monday. First pitch from T-Mobile Park is set for 9:40 p.m. ET. Let’s analyze FanDuel Sportsbook’s lines around the Royals vs. Mariners odds and make our expert MLB picks and predictions for the best bets.

Season series: First meeting; Seattle won 6-1 last season

Kansas City beat the Los Angeles Angels 4-2, covering as a +101 road underdog Sunday. The Royals never trailed as they scored all 4 of their runs in the 4th inning for a 4-0 lead. RHP Seth Lugo picked up the win, pitching 8 innings of 1-run ball on 5 hits and no walks while striking out 12. Kansas City took 3 of 4 in the series, only dropping the Saturday contest.

Seattle routed the Oakland Athletics 8-4 Sunday, covering as a -203 home favorite in the rubber match of a 3-game set. The Mariners jumped out to a 5-0 lead after the 2nd. From there, keeping the lead was easy behind RHP Luis Castillo, who pitched 6 innings and allowed 2 earned runs on 7 hits and 0 walks with 8 K’s. It was a nice bounceback victory after losing Saturday 8-1.

Royals at Mariners projected starters

RHP Brady Singer vs. RHP George Kirby

Singer (3-1, 2.36 ERA) makes his 9th start. He has a 1.01 WHIP, 3.0 BB/9 and 9.1 K/9 through 45 2/3 innings.

  • Last start: Win, 5 1/3 IP, 1 ER, 5 H, 2 BB, 4 K in 6-4 home win vs. Milwaukee Brewers Wednesday
  • Career vs. Mariners: 1-1, 2.88 ERA (25 IP, 8 ER), 19 H, 7 BB, 28 K across 4 starts and 1 relief appearance

Kirby (3-3, 4.15 ERA) makes his 9th start. He has a 1.04 WHIP, 1.0 BB/9 and 9.3 K/9 through 43 1/3 innings.

  • Last start: Loss, 5 IP, 4 ER, 4 H, 1 BB, 4 K in 6-3 road loss at Minnesota Twins Wednesday
  • Career vs. Royals: 0-0, 6.00 ERA (6 IP, 4 ER), 8 H, 0 BB, 2 K in 1 start last season

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Royals at Mariners odds

Provided by FanDuel Sportsbook; access USA TODAY Sports Scores and Sports Betting Odds hub for a full list. Lines last updated at 1:50 a.m. ET.

  • Moneyline (ML): Royals +124 (bet $100 to win $124) | Mariners -146 (bet $146 to win $100)
  • Run line (RL)/Against the spread (ATS): Royals +1.5 (-178) | Mariners -1.5 (+146)
  • Over/Under (O/U): 7 (O: -106 | U: -114)

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Royals at Mariners picks and predictions

Prediction

Mariners 6, Royals 5

Moneyline

LEAN SEATTLE (-146). 

Seattle has won 2 of its last 3 games and is 13-9 at home this season. The Mariners have also won 6 consecutive games against Kansas City and are 7-3 in the last 10 head-to-head matchups dating back to 2022.

This is only a lean because the Mariners are 2-2 in their last 4 home games, while the Royals are 3-1 in their last 4 road games.

Run line/Against the spread

PASS. 

I fully expect the Royals to cover here as +1.5 (-178) underdogs, but the line is set too heavily to risk betting on. Back the moneyline and/or total instead.

Over/Under

BET OVER 7 (-106). 

The Over has hit in 6 consecutive games for Seattle and is 3-0-1 in its last 4 home games. For Kansas City, the Over is 4-2 in its last 6 games. The Over has also hit in 8 of the last 10 Kansas City-Seattle matchups.

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