The second match day of the 2015/16 UEFA Champions League took place on Tuesday night with a number of surprise results.
The biggest shock of the night came in North London where Arsenal were beaten 3-2 by Olympiakos at the Emirates Stadium.
The Greek club went ahead on two occasions only to see the Gunners fight back but ultimately came away with a famous win courtesy of Alfred Finnbogason's 66th-minute winner.
Arsene Wenger's Gunners are now sitting at the foot of Group F without a point from their two fixtures while Marco Silva's Olympiakos occupy second position behind Bayern Munich.
Bundesliga champions Bayern hold the monopoly on the group after beating Dinamo Zagreb 5-0 at the Allianz Arena, in what was the Croatian giants' first defeat in 46 matches.
Robert Lewandowski scored a hat-trick, making it 10 goals in his last three appearances in all competitions, while Douglas Costa and Mario Gotze were also on the scoresheet for Pep Guardiola's Bavarians.
In Group G, FC Porto caused an upset of sorts by defeating Chelsea 2-1 in Jose Mourinho's return to Estadio do Dragao, just as they did when he took his Blues side of 2005 to northwest Portugal.
Willian scored a lovely free-kick on the stroke of half-time, either side of goals from Andre Andre and Maicon, but the reigning Premier League champions came up short to fall to third place on the group table where they now sit below Porto and Dynamo Kyiv who beat Maccabi Tel Aviv 2-0 in Israel.
Barcelona saved their blushes against Bayer Leverkusen by coming from behind to win 2-1 at Camp Nou thanks to late goals from Sergi Roberto and Luis Suarez following Kyriakos Papadopoulos' 22nd-minute opener to move to the top of Group E while Belarusian side BATE Borisov shocked AS Roma 3-2 in Barysaw courtesy of a stunning brace from Filip Mladenovic, leaving Italian giants at the bottom of the table.
And in Group H, Zenit Saint Petersburg made it two from two by edging Belgian outfit Gent 2-1 in Russia as Valencia got the better of Lyon 1-0 in France to move to second spot.
Wednesday night's fixtures includes Manchester United at home to Wolfsburg, Manchester City away at Borussia Monchengladbach, Real Madrid's meeting with Malmo in Sweden and Paris Saint-Germain's trip to Shakhtar Donetsk.
2015/16 UEFA CHAMPIONS LEAGUE - GROUP STAGE SCORES
Group E
Barcelona (SPN): 2 (Sergi Roberto 80', Luis Suarez 82')
Bayer Leverkusen (GER): 1 (Kyriakos Papadopoulos 22')
Camp Nou, Barcelona, Spain - 68,694
BATE Borisov (BLR): 3 (Ihar Stasevich 8', Filip Mladenovic 12'/30')
AS Roma (ITA): 2 (Gervinho 66', Vasilis Torosidis 82')
Boris Arena, Barysaw, Belarus - 12,767
Group F
Bayern Munich (GER): 5 (Douglas Costa 13', Robert Lewandowski 21'/28'/55', Mario Gotze 25')
Dinamo Zagreb (CRO): 0
Allianz Arena, Munich, Germany - 70,000
Arsenal (ENG): 2 (Theo Walcott 35', Alexis Sanchez 65')
Olympiakos (GER): 3 (Felipe Pardo 33', David Ospina (OG) 40', Alfred Finnbogason 66')
Emirates Stadium, London, England - 59,428
Group G
Maccabi Tel Aviv (ISR): 0
Dynamo Kyiv (UKR): 2 (Andriy Yarmolenko 4', Junior Moraes 50')
Sammy Ofer Stadium, Haifa, Israel - 27,100
FC Porto (POR): 2 (Andre Andre 39', Maicon 52')
Chelsea (ENG): 1 (Willian 45+2')
Estadio do Dragao, Porto, Portugal - 46,120
Group H
Lyon (FRA): 0
Valencia (SPN): 1 (Sofiane Feghouli 42')
Stade de Gerland, Lyon, France - 33,534
Zenit Saint Petersburg (RUS): 2 (Artyom Dzyuba 35', Oleg Shatov 67')
Gent (BEL): 1 (Thomas Matton 56')
Petrovsky Stadium, Saint Petersburg, Russia - 18,095
