Seattle Mariners vs Kansas City Royals Prediction & Picks - MLB

Prediction published on 9/17/25, 4:03 PM  by Lou Aguila in MLB Picks

As expected, the Seattle Mariners dismantled the Kansas City Royals in Tuesday’s Game 1, extending their win streak to 10 games.

The Royals, who are 8-2 against the spread in their last 10 games, are listed at +155 (payout of $255 per $100 Bet) to cover the 1.5-run handicap against the reeling Royals.

Current Form:

The Mariners blasted the Royals 12-5 in Game 1 to push their winning streak to 10 games. Despite their hot run, Seattle (83-68) is still facing pressure from the Houston Astros (83-69), who are only a half-game behind them in the AL West standings.

The Royals have gone 1-4 in their last five games and 2-7 in their last 9 games. Tuesday’s loss dropped Kansas City’s record below .500 at 75-76, which is 7.5 games off of the last wild card spot currently occupied by the 82-69 Boston Red Sox.

Offense:

The Mariners’ offensive numbers are skyrocketing this September, especially in their last five games, during which they have averaged 7.5 runs per game on a .282 batting average.

The Royals are averaging a decent 5.0 runs per game on a .247 batting average in their last five games.

Pitching & Starters.

The Mariners boast a 2.81 ERA over their last five games. Bryce Miller, who is 4-1 with a 5.67 ERA in his last five starts, will hit the mound on Wednesday.

The Royals have pitched to a 7.29 Earned Run Average. Cole Ragans, who carries a 7.29 ERA over his last five starts and has allowed five earned runs in his last start vs. St. Louis, gets the nod to start in Game 2.