Fulham were replaced by West Brom at the top of the Sky Bet Championship table after the Cottagers' unbeaten start to the season ended with a 1-0 loss at Blackpool.
Josh Bowler struck the only goal of the contest at Bloomfield Road in the 49th minute as Fulham suffered the first defeat of boss Marco Silva's tenure.
West Brom moved to the summit despite being held at the Hawthorns by Millwall, who secured a 1-1 draw via Daniel Ballard's 55th-minute header.
That came six minutes after Kyle Bartley had put the hosts in front, with Albion - still undefeated in the league this term under Valerien Ismael - having earlier failed to convert a penalty, Karlan Grant seeing his effort in first-half stoppage time saved by Bartosz Bialkowski.