Chelsea closed to within just a point of Premier League leaders Manchester United with a 5-0 win away to Portsmouth on Wednesday.
Didier Drogba scored twice to take his tally to 24 goals in 27 league matches. Florent Malouda also scored twice with Frank Lampard adding a fifth.
Elsewhere, Australia's Tim Cahill scored for Everton in a 2-0 win over Manchester City as the Merseysiders became the first away side to win in the league at Eastlands this term — a result that dented their hosts' hopes of Champions League qualification.
Meanwhile Aston Villa and Sunderland drew 1-1.