Roma, playing at home in the UEFA Champions League Group C, stunned Chelsea, the English Premier League Champions with a 3-0 victory.
A stunning first-minute goal from Stephan El Shaarawy set the tone as Roma eased to a victory that moved them top of the group, a point ahead of Chelsea.
El Shaarawy scored again in the 36th minute and Diego Perotti added a third after the hour mark as Chelsea became the first of the five English contenders to taste defeat in this season’s group stage.
Chelsea Coach Antonio Conte said the team played well in the first half but they weren’t clinical enough with the chances they created.
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He simply described the second half as disappointing as the team played out-of-sort.
Qarabag, the Azerbaijani debutants, surprised Atletico Madrid when they scored first on Tuesday.
The team was in dreamland of a first win when Míchel headed in not long before half-time.
But Thomas Partey levelled in the 56th minute and not long after Qarabağ lost Pedro Henrique to a red card, followed late in the game by Atlético’s Stefan Savić.
Atlético, also without a win, are four points off second-placed Chelsea with Qarabağ one further behind.