The Kansas City Royals grabbed a 7-5 victory over the Seattle Mariners, stopping their winning ways and dropping them to second place in the American League West

Seattle manager Dan Wilson initiated a replay challenge for a shift violation. Wilson believed Royals second baseman Michael Massey hadn’t been fully on the infield dirt — with one foot perhaps instead encroaching onto the outfield grass — before the pitch was thrown.

Adam Frazier hit a go-ahead, two-run home run in the eighth inning and the Kansas City Royals beat Seattle 7-5 to snap the Mariners’ 10-game winning streak.

View news about the Seattle Mariners vs. Kansas City Royals game played on September 17, 2025 including player news, injury news, predictions, analysis and more.

The Seattle Mariners are sticklers for the new shift rule. As the Mariners faced he Kansas City Royals on Thursday, Royals' second baseman Michael Massey lined up with his heels slightly touching the outfield grass, which is technically illegal with the new rule implemented this season.

The Seattle Mariners play the Kansas City Royals after Eugenio Suárez had four hits against the Royals on Wednesday.

The Kansas City Royals are fighting for their playoff lives and welcome back a key piece of their starting rotation from the injured list.

A strange rule violation ended up playing a key factor in why the Kansas City Royals narrowly lost their Thursday afternoon contest to the Seattle Mariners.

Following their ten-game winning streak being snapped by the Kansas City Royals on Wednesday, the Seattle Mariners came firing back in the final game of the tea