Everton's Gylfi Sigurdsson piled the pressure on former manager Paul Clement with a brilliant strike in the 3-1 victory to leave Swansea rooted to the bottom of the Premier League.
The Iceland international, who left the Swans in a £45million summer move, scored the vital second after Dominic Calvert-Lewin had cancelled out Leroy Fer's opener by converting Wayne Rooney's saved penalty on the stroke of half-time.
Rooney then made sure of the points with his sixth goal in five games when the hosts were controversially awarded a fortuitous second spot-kick in the 72nd minute.
It left Clement, who took over on January 3 with the club bottom of the table and guided them to safety, battling to save his job as shot-shy Swansea currently have a similar record to the one which led to Bob Bradley's sacking almost a year ago.