Chelsea made a swaggering start to their Champions League challenge as memorable strikes from Pedro and Davide Zappacosta inspired a 6-0 rout of Qarabag on Tuesday.
Pedro gave Chelsea a fifth-minute lead with a fine strike from the edge of the box.
Zappacosta was making his home debut for Chelsea after his deadline day move from Torino and he marked the occasion with his first goal for the club, a cross-shot that capped a lung-bursting run from the Italy right-back.
Cesar Azpilicueta headed in a third ten minutes after the break.
Tiemoue Bakayoko added the fourth on his Champions debut for Chelsea before Michy Batshuayi scored twice to give Chelsea their joint biggest Champions League win.