Seahawks Defeat Chiefs 20-3, Ending Kansas City’s Undefeated Start

The Seattle Seahawks defeated the Kansas City Chiefs 20-3 on Sunday, handing Kansas City its first loss of the season.

Mahomes finished with five yards per pass attempt and a 58.3 passer rating, the fifth‑lowest of his career.

He also threw an interception and completed a handful of off‑target passes in the first half.

Seattle wide receiver Jaxon Smith‑Njigba recorded nine receptions for 150 yards and a touchdown.

The Seahawks’ defense dominated Mahomes throughout the contest.

The defeat ended the Chiefs’ unbeaten start to the 2026 season.

The final score was 20-3 in favor of Seattle.