Davide Zappacosta scored a wonder goal on his full debut as Chelsea made a resounding return to the Champions League with a 6-0 win against Azerbaijani champions Qarabag at Stamford Bridge.
Zappacosta beat goalkeeper Ibrahim Sehic with a spinning cross-shot from almost on the touchline to put Antonio Conte's team two up following Pedro's fifth-minute 20-yard strike.
Cesar Azpilicueta headed a third early in the second half, before a first Chelsea goal from Tiemoue Bakayoko and a brace from Michy Batshuayi saw Conte's side blitz Qarabag with three strikes in 11 minutes.
The tournament debutants from Azerbaijan rarely looked like troubling Thibaut Courtois in the home goal, with South African centre-forward Dino Ndlovu limited to speculative efforts from distance as the hosts cruised to a comfortable opening-day victory in Group B.
Player ratings
Chelsea: Courtois (6), Azpilicueta (7), Christensen (6), Cahill (6), Zappacosta (8), Kante (8), Fabregas (7), Alonso (7), Willian (9), Batshuayi (8), Pedro (8)
Subs: Bakayoko (7), Hazard (7), Rudiger (6)
Qarabag: Sehic (5), Medvedev (5), Sadigov (5), Rzezniczak (4), Huseynov (5), Garayev (4), Michel (4), Henrique (7), Almeida de Oliveira (6), Guerrier (6), Dino (5)
Subs: Diniyev (5), Madatov (6), Elyounoussi (5)
Man of the match: Willian