Chiefs lose, leave Pats, Niners as NFL's lone unbeaten teams

Kansas City Chiefs quarterback Patrick Mahomes, right, tumbles after a sack by Indianapolis Colts defensive tackle Grover Stewart (90) during the second half of an NFL football game in Kansas City, Mo., Sunday, Oct. 6, 2019. (AP Photo/Reed Hoffmann)

Pittsburgh Steelers quarterback Mason Rudolph (2) is helped from the field after he was injured in the second half of an NFL football game against the Baltimore Ravens, Sunday, Oct. 6, 2019, in Pittsburgh. (AP Photo/Gene J. Puskar)

New England Patriots quarterback Tom Brady (12) reacts to a touchdown against the Washington Redskins during the second half of an NFL football game, Sunday, Oct. 6, 2019, in Washington. (AP Photo/Mark Tenally)

Kansas City Chiefs quarterback Patrick Mahomes holds his leg after he was tackled by Indianapolis Colts defensive ends Kemoko Turay and Justin Houston during the second half of an NFL football game in Kansas City, Mo., Sunday, Oct. 6, 2019. (AP Photo/Reed Hoffmann)

Kansas City Chiefs quarterback Patrick Mahomes (15) is tackled by Indianapolis Colts defensive end Jabaal Sheard (93) and defensive end Kemoko Turay (57) during the second half of an NFL football game in Kansas City, Mo., Sunday, Oct. 6, 2019. (AP Photo/Reed Hoffmann)