KANSAS CITY, Mo. (Interstat) — In a gritty, low-scoring affair that defied pregame projections, the Denver Broncos clinched the AFC West title on Christmas Day with a methodical 20-13 victory over the Kansas City Chiefs at GEHA Field at Arrowhead Stadium on Thursday.

A crowd of 73,045 watched as the Broncos, improving to 13-3, relied on a steady, mistake-averse performance from quarterback Bo Nix and a suffocating defensive effort to sweep the season series from their division rivals and eliminate the reeling Chiefs from playoff contention. Kansas City fell to 6-10 with the loss.

The most important part of the game was Denver’s commanding and time-consuming response after Kansas City pulled within three points in the fourth quarter. Leading 17-13 with just over eight minutes remaining, the Broncos embarked on a 14-play, 65-yard drive that consumed 6 minutes and 18 seconds of clock. The series, which included four runs by RJ Harvey and three key completions by Nix, culminated in a 1-yard touchdown pass from Nix to Harvey on third down with 1:45 left. That score pushed Denver’s lead to 20-13 and left the Chiefs with only one timeout and insufficient time to mount a matching touchdown drive.

The game was a stark contrast to the high-flying offensive showdown many anticipated. Interstat’s game simulator had projected a 30-23 Kansas City win, and the Chiefs were installed as 13.5-point favorites. Instead, the contest became a defensive struggle defined by field position and efficiency.

Denver set the tone early with a meticulous 15-play, 56-yard opening drive that resulted in a 27-yard Wil Lutz field goal. The Broncos defense then forced a quick punt, but Nix was intercepted by Chiefs linebacker Nick Bolton on Denver’s next possession. Kansas City capitalized on the short field, with quarterback Chris Oladokun finding Brashard Smith for a 5-yard touchdown pass early in the second quarter to take a 7-3 lead.

The Broncos answered with another long drive just before halftime. Nix engineered a 12-play, 63-yard march in the final two minutes, setting up a 30-yard Lutz field goal as time expired to trim the Chiefs’ lead to 7-6 at the intermission.

Denver reclaimed control on its first possession of the second half. Nix led an 11-play, 72-yard touchdown drive, capping it himself with a 9-yard scramble for a score to give the Broncos a 13-7 lead after the extra point. Kansas City responded with a 53-yard field goal from Harrison Butker to make it 13-10, and Butker added another from 47 yards early in the fourth quarter to tie the game at 13.

The tie was short-lived. Nix immediately guided Denver on a 75-yard touchdown drive, highlighted by his 8-yard scramble on third-and-8 and a 17-yard strike to Lil’Jordan Humphrey. That series ended with Lutz’s third field goal, a 29-yarder, to put Denver ahead 16-13. The subsequent, decisive 65-yard touchdown drive sealed the victory.

Nix, the top star for Denver, was efficient and effective with his legs. He completed 26 of 38 passes for 182 yards and one touchdown without an interception, and added 42 rushing yards and another score on nine carries. Harvey was his primary weapon, rushing for 43 yards on 14 attempts and catching five passes for 33 yards and the clinching touchdown.

For Kansas City, the offense never found rhythm. Oladokun, starting in place of an injured Patrick Mahomes, struggled against constant pressure, completing 13 of 22 passes for just 66 yards and one touchdown. The Chiefs managed only 229 total yards. Bolton led all defenders with 12 tackles and an interception.

The Broncos’ defense was relentless, recording three sacks and limiting Kansas City to 3 of 12 on third-down conversions. Denver’s offense, while not explosive, was ruthlessly efficient, converting 10 of 18 third downs and holding the ball for over 36 minutes.

With the win, Denver secured the division crown and a home playoff game. The Chiefs, a preseason favorite, saw their season end with a fourth consecutive loss and will miss the postseason for the first time in over a decade. Denver concludes its regular season at home against the Los Angeles Chargers on Jan. 3 or 4, while Kansas City finishes its disappointing campaign at the Las Vegas Raiders on Jan. 3.