ST. LOUIS (AP) -- Matt Cassel made a rapid recovery. The Kansas City Chiefs did, too, riding their comeback quarterback to a crucial victory over their cross-state rivals.
Cassel went the distance only 11 days after an emergency appendectomy, leading the way in a 27-13 victory over the suddenly sagging St. Louis Rams on Sunday.
Jamaal Charles scored on a short run and helped clinch it with a late 80-yard burst for the Chiefs (9-5), who retained a one-game lead over the Chargers in the AFC West.
Kansas City managed only 67 yards in a 31-0 loss at San Diego last week with backup quarterback Brodie Croyle starting, and ended a seven-quarter scoreless drought on Cassel's 2-yard pass to Leonard Pope midway through the second quarter.
Thomas Jones became the NFL's 25th player to rush for 10,000 yards and scored the final touchdown on a 2-yard run with 3:26 to go, one play after Ron Bartell ran down Charles just shy of the goal line. Charles had 126 yards on 11 carries and Jones had 62 yards on 22 carries, and the Chiefs totaled 213 yards rushing.
Cassel was questionable after getting limited work in practice, but led the team on the field for warmups and didn't miss a snap while going 15 for 29 for 184 yards. He was rarely hit by the Rams, who sacked him twice on the same series in the third quarter but couldn't rattle him, and even produced a first down with a 13-yard scramble in the second quarter.
The Rams (6-8) fizzled after a strong start, losing their second straight and missing a shot to solidify first place in the weak NFC West. Sam Bradford became the third rookie in the NFL to pass for 3,000 yards but it came in one of his worst performances.
Bradford was 21 for 43 for 181 yards and two interceptions, both times by Kendrick Lewis. Bradford was sacked three times, all by Wallace Gilberry, to lead a pass rush that hounded him all day.
The Rams led 6-0 after field goals to end the first two possessions but totaled one first down in the second and third quarters while the Chiefs scored 20 straight points.
St. Louis got its first five first downs of the second half on a 12-play, 72-play, drive capped by Steven Jackson's 5-yard run that cut the margin to 20-13 with 4:04 to go on. The next play after the kickoff, Charles broke loose for an 80-yard jaunt to the Rams 2, and Jones took it in the next play.
The Chiefs have won five straight in the series since 1997, and were helped in this one by thousands of vocal fans who made the trip across Interstate 70. Gov. Jay Nixon attended and presented the Governor's Cup trophy, usually awarded after a preseason game.
Jones, who alternates with Charles, hit the 10,000-yard plateau on a 4-yard carry early in the third quarter. Jones entered the game needing 17 yards and finished with 62 yards on 22 carries after totaling 1 yard on three attempts last week.
Two field goals by Josh Brown field goals in the first quarter ended the Rams' three-game slow-starting slump during which opponents outscored them 30-0 the first two possessions. The Chiefs managed only 16 yards on nine plays in the first quarter, and Cassel threw into a crowd on an interception by Kevin Dockery to end the second series, but outgained St. Louis 155-8 in the second quarter.
Offensive tackle Jason Smith was whistled for three penalties in the first half -- false start, illegal use of hands and holding -- and the Rams had 50 yards overall on seven calls.
The Chiefs finished 3-5 on the road. They had been allowing an average of 32 points the previous five road games.
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