Pedro Rodriguez enjoyed a Chelsea debut to remember but John Terry was sent off as Jose Mourinho's side beat West Bromwich Albion 3-2 for their first Premier League win of the season.
Pedro, who signed from Barcelona this week, scored and grabbed an assist at The Hawthorns as Chelsea bounced back from their 3-0 loss to Manchester City last week.
Goalkeeper Thibaut Courtois was Chelsea's hero on 14 minutes when he saved James Morrison's penalty kick with his legs after Nemanja Matic had brought down Callum McManaman in the area.
Chelsea broke the deadlock on 20 minutes through debutant Pedro, who played a one-two with Eden Hazard before seeing his shot deflected into the bottom corner.