Chelsea enjoyed a triumphant return to the Champions League after a year out on Tuesday, thumping the competition's debutants Qarabag 6-0.
Pedro opened the scoring on the five minutes into the match with a 20-yard curling shot from the edge of the area.
Italy right-back Davide Zappacosta, on his first Blues start, scored a stunner as he ran 50 yards down the right wing, before sending over a cross that flew past Ibrahim Sehic.
Cesar Azpilicueta headed home a third after the break from Cesc Fabregas' cross.
Willian hit the crossbar, and substitute Tiemoue Bakayoko scored his first Blues goal with a deflected shot from close range.
Michy Batshuayi then scored twice in the final 15 minutes – firing in from outside the box after being picked out in space by Bakayoko and then scrambling home Zappacosta's cross.
The win was always likely to be the easiest game in the group, with Roma and Atletico Madrid the other two teams in Group C. Those sides drew 0-0 in Rome's Olympic Stadium.