How will the Kansas City and Seattle fare today? Here is what to know, including kick-off time, TV channels and live stream options

Sunday Night Football this week is a blockbuster. The Chiefs take their undefeated record to Seattle, where the defending-champ Seahawks should have an early sense of urgency. Mike Macdonald’s team enter at 3-3, already a full three games (plus, for now, a tiebreaker) behind the gangbusters 49ers. To have any real shot at a home playoff game — a critical edge in last year’s Super Bowl run — the Seahawks need to get a win against a resurgent Chiefs squad who nothing like the husk they appeared to be down the stretch last season.

In addition to a clash between two marquee franchises, the evening is a homecoming for one of the most important players of the young season: Kenneth Walker III. The Seahawks-turned-Chiefs running back has been key to KC’s offensive revitalization after signing as a free agent following his Super Bowl MVP nod with Seattle. The Chiefs were in the bottom half of the league in rushing yards per carry last year but this season hold a whopping lead over the second-place team, averaging 5.5 yards to the Bills’ 5.1. The 26-year-old Walker is having a career year and has worked his way from “good player” to “maybe the Offensive Player of the Year.”

The early standouts have emerged. But even the best teams have flaws that can be exposed by their opponents

Who would have thought the 49ers would be here after a rough old offseason? Head coach Kyle Shanahan’s participation in training camp was limited due to a serious car crash, team owner Jed York’s visit to an Ohio trailer park did not end well, and one player after another endured serious injuries. Despite all this, San Francisco are full of positive vibes. They are top of a tough division and their immense defense, led by the intensity of players such as safety Malik Mustapha and Fred Warner, is complemented by an equally impressive offense.

• Defensive end played for Chiefs for eight seasons

• Andy Reid says player’s death ‘makes you sick’

Patrick Mahomes and Andy Reid have spoken of their sadness after former Kansas City Chief Allen Bailey died at the age of 37.

The defensive end was found dead at his home in Florida on Tuesday by his wife. He is believed to have died from natural causes.