1. KANSAS CITY (4-0)
LAST WEEK: 1
Only Detroit's Billy Sims in 1980 has ever rushed for more yardage in his first four games than Kareem Hunt, who has 502 yards through four games but Hunt's gaudy per-carry average of 7.4 yards is 1.7 yards more than that of Sims.
2. DENVER (3-1)
LAST WEEK: 6
Why is Denver so high? Because their combined offense/defense per-possession efficiency rank is the league's highest through four weeks.
The Broncos have the league's best record in the first quarter of the season the last five seasons, going 17-2 in Weeks 1-4 since 2013.