Chelsea scored an added-time winner at Atlético on a night when 'MCN' starred for Paris against Bayern, Basel racked up a record victory and Celtic ended a long drought.
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- Watch highlights of all Wednesday's night's games
- Chelsea score 93rd-minute winner away to Atlético
- 'MCN' steal show as Paris beat Bayern 3-0
- Record victory for Basel, United score four, Celtic win away
- Next group stage fixtures take place on 17 and 18 October
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On a night of impressive performances, Basel could reasonably lay claim to the best of them all, Dimitri Oberlin scoring twice in the Swiss club's biggest ever UEFA Champions League win.
United hit four for the fifth time in ten games this season, Romelu Lukaku's double in Moscow taking his tally to ten goals in nine appearances for his new employers.
Paris sent out a statement of intent with a splendid victory. Dani Alves opened the scoring after just two minutes before Edinson Cavani and Neymar also found the net.
Leigh Griffiths, Patrick Roberts and Scott Sinclair were on the mark as Celtic achieved their first European away win in 17 attempts.
Kostas Manolas and Edin Džeko struck inside 15 minutes as Roma got the better of the first UEFA Champions League group stage fixture to be played in Azerbaijan.
Michy Batshuayi scored three minutes into added time as Chelsea came from behind to inflict defeat on Atlético in their first European game at the Estadio Metropolitano; Diego Simeone's side had been 11 home matches unbeaten in this competition.
A Sebastián Coates own goal four minutes into the second half was enough for Barcelona to maintain their 100% start to the group stage.
Juve were frustrated for three-quarters of Takis Lemonis's first game back at the Olympiacos helm, but efforts from Gonzalo Higuaín and Mario Mandžukić ensured they picked up their first win of the campaign.
Group E: Sevilla 3-0 Maribor, Spartak Moskva 1-1 Liverpool
Group F: Manchester City 2-0 Shakhtar Donetsk, Napoli 3-1 Feyenoord
Group G: Beşiktaş 2-0 RB Leipzig, Monaco 0-3 Porto
Group H: Borussia Dortmund 1-3 Real Madrid, APOEL 0-3 Tottenham