Manchester United lost ground at the top of the table as their former striker Joshua King scored the winner in Bournemouth's 2-1 triumph.
After David de Gea had been beaten direct from a corner kick by Junior Stanislas early on, United went level thanks to Marouane Fellaini's goal.
The visitors faded after the break and could not fight back after King fired in from Matt Richie's set-piece.
United will slip to fifth if Tottenham beat Newcastle on Sunday.
The scoreline and final few minutes could have been more comfortable for the hosts, but substitute Glenn Murray squandered two excellent chances to put Bournemouth further out of reach.