Mahomes outplayed Mitchell Trubisky, throwing for two touchdowns and running for another score, and the Chiefs beat the Chicago Bears 26-3 Sunday night for their fifth straight win.
Kansas City (11-4) remained a game behind New England for the AFC's second seed. The Patriots clinched their 11th consecutive AFC East championship by beating Buffalo on Saturday. The Chiefs hold the head-to-head tiebreaker over New England thanks to a victory two weeks ago that helped secure their fourth AFC West title in a row.
Mahomes' big game in his first appearance at Soldier Field is just another blow for Chicago in a rough season that began with Super Bowl hopes. The Bears passed on Mahomes when they traded up a spot to grab Trubisky with the No. 2 overall pick in 2017. Mahomes went to Kansas City at No. 10 and won the MVP award last season.
Trubisky has not performed the way the Bears envisioned. And with their playoff hopes already dashed coming off an NFC North championship, they got outclassed by Kansas City.
Mahomes, playing his 30th game, became the fastest player to reach the 9,000-yard passing mark. He was 23 of 33 for 251 yards, giving him 9,238 in three seasons. Hall of Famer Kurt Warner did it in 32 games.
Mahomes also has 75 touchdown passes, making him the fastest player to hit that mark.
Travis Kelce, already the first tight end with four straight 1,000-yard seasons, became the first to reach 1,200 yards in back-to-back years. He caught eight passes for 74 yards, giving him 1,205 this year. That included a 6-yard touchdown near the end of the first half.
Harrison Butker kicked a career-best 56-yard field goal that was the fourth-longest in franchise history. He also hit both the left and right uprights on a missed extra point.
The Bears (7-8) dropped their second straight after winning four of five.
Trubisky completed 18 of 34 passes for 157 yards. Kahlil Mack had a sack, and fans let the Bears have it before heading toward the exits in the closing minutes.
The Bears visit Minnesota on Dec. 29.