Chiefs beat Raiders, move to 4-0 behind Patrick Mahomes and Kenneth Walker III

LAS VEGAS — Patrick Mahomes remained undefeated at Allegiant Stadium, passing for 225 yards and two touchdowns, and Kenneth Walker III rushed for 177 yards and two TDs to lead the Chiefs to a 30-27 victory over the Las Vegas Raiders on Sunday. Walker’s two-yard touchdown run with 3:21 left put the Chiefs (4-0) ahead for good at 23-19. It was set up by Tyquan Thornton’s 55-yard reception on the previous play. Thornton, who had five catches for 111 yards and two touchdowns, suffered a gruesome-looking left leg injury on the play and was carted off. Kirk Cousins passed for…