Arsenal, Chelsea and Roma all experienced a miserable night yesterday as they crashed to damaging defeats that severely dent their hopes of making progress to the knock-out stages of the Champions League.

Arsenal lost an astonishing clash 3-2 to Olympiakos Piraeus who won a competitive European match in England for the first time in 50 years.

After losing their opening game to Dinamo Zagreb two weeks ago, Arsenal are bottom of Group F, six points behind leaders Bayern Munich, who they have to play twice.

Olympiakos, whose 12 previous visits to England all ended in defeat, went ahead when Felipe Pardo’s 33rd minute shot took a deflection off Alex Oxlade-Chamberlain and flew past goalkeeper David Ospina.

Arsenal were level two minutes later when Theo Walcott scored, but Olympiakos went 2-1 up when Ospina mishandled a corner and dropped the ball over his line with the fifth official signalling a goal.

Alexis Sanchez equalised for the hosts with a neat header in the 65th but a minute later Icelandic substitute Alfred Finnbogason put Olympiakos ahead again and they held on to seal a famous victory at The Emirates.

Bayern Munich are firmly in control of Group F as Robert Lewandowski continued his remarkable scoring run with a hat-trick in a 5-0 thrashing of Dinamo Zagreb to snap the Croats’ 45-game unbeaten run.

In an explosive first half in which Bayern were 4-0 up inside half an hour, Lewandowski, who has notched a staggering 10 goals in their last three matches, including five in a record nine-minute spell against VfL Wolfsburg last week, netted twice in seven minutes after Brazilian Diego Costa had put Bayern ahead.

Mario Goetze added his second of the campaign before Poland captain Lewandowski chipped keeper Eduardo in the 55th minute for his third goal as the title favourites moved to a maximum six points from two matches.

Jose Mourinho suffered a nightmare homecoming as Porto, the club he led to the Champions League title in 2004, inflicted a 2-1 defeat on his woefully out-of-sorts Chelsea side in Group G.

Mourinho sprang a surprise before the game by leaving out Eden Hazard, Nemanja Matic and Oscar and the Londoners went behind after 39 minutes when Yacine Brahimi produced a surging run down the left and Andre Andre scored.

Brazil playmaker Willian equalised with the last move of the first half, curling a delightful free-kick into the top corner of the net from 25 metres.

Porto then went back in front seven minutes after the break when Maicon stooped low at the near post to head a left-wing corner past keeper Asmir Begovic.

Diego Costa was agonisingly close to a second goal for Chelsea when his wicked drive from 25 metres hit the underside of the bar and came out.

But Chelsea, who won the Premier League last season but are struggling sixth from bottom in their domestic championship this term, could have fallen further behind.

Porto laid siege to the visitors’ goal in the last 20 minutes and Begovic had to be at his best to keep his team in the game.

Victory was especially sweet for Porto goalkeeper Iker Casillas who broke the Champions League appearance record by featuring in his 152nd game in the competition.

Porto have four points from two games in Group G while Chelsea have three.

Barcelona rally

Two late goals in two minutes from Sergi Roberto and Luis Suarez gave Barcelona a remarkable 2-1 home win over Bayer Leverkusen in Group E.

Trailing 1-0 at the Nou Camp with 10 minutes to go, Sergi poked in a rebound from close range, and moments later Suarez swept the ball home from just inside the area.

Kyriakos Papadopoulos put the German side ahead after 22 minutes from a corner, with Barca keeper Marc-Andre Ter Stegen beaten in the air.

For reigning champions Barca, who were without their injured talisman Lionel Messi who is nursing a knee ligament injury, it was a frustrating game of missed chances until their pressure told.

Barca lead Group E on four points from two games, one ahead of Leverkusen and BATE Borisov who shocked injury-hit Roma 3-2 in Ukraine yesterday.

BATE went 3-0 up in the first 30 minutes through Ihar Stasevich and two from Filip Mladenovic.

The Serie A club hit back after the break and reduced the deficit with strikes from Gervinho, after 66 minutes, and Vasilis Torisidis eight minutes from time.

Roma’s Alessandro Florenzi also hit the crossbar late on but BATE held on for a famous win.

Summaries

Barcelona 2
Sergi 80; Suarez 82;
B. Leverkusen 1
Papadopoulos 12;

B. Borisov 3
Stasevich 8; Mladenovic 12, 31;
Roma 2
Gervinho 66; Torosidis 82;

Arsenal 2
Walcott 35; Sanchez 65;
Olympiakos 3
Pardo 33; Ospina 40og; Finnbogason 66;

B. Munich 5
Costa 13; Lewandowski 22; Lewandowski 28, 55; Goetze 25;
D. Zagreb 0

M. Tel Aviv 0
D. Kiev 2
Yarmolenko 4; Moraes 50;

Porto 2
Andre 39; Maicon 52;
Chelsea 1
Willian 45;

Lyon 0
Valencia 1
Feghouli 42;

Zenit SP 2
Dzyuba 35; Shatov 67;
Ghent 1
Matton 56;

Group E

	P	W	D	L	F	A	Pts
Barcelona	2	1	1	0	3	2	4
B. Leverkusen	2	1	0	1	5	3	3
B. Borisov	2	1	0	1	4	6	3
Roma	2	0	1	1	3	4	1

B. Leverkusen vs B. Borisov - 4-1
Roma vs Barcelona - 1-1
Barcelona vs B. Leverkusen - 2-1
B. Borisov vs Roma - 3-2
20-10-2015: B. Borisov vs Barcelona
20-10-2015: B. Leverkusen vs Roma
04-11-2015: Barcelona vs B. Borisov
04-11-2015: Roma vs B. Leverkusen
24-11-2015: B. Borisov vs B. L’kusen
24-11-2015: Barcelona vs Roma
09-12-2015: B. L’kusen vs Barcelona
09-12-2015: Roma vs B. Borisov

Group F

	P	W	D	L	F	A	Pts
B. Munich	2	2	0	0	8	0	6
Olympiakos	2	1	0	1	3	5	3
D. Zagreb	2	1	0	1	2	6	3
Arsenal	2	0	0	2	3	5	0

D. Zagreb vs Arsenal - 2-1
Olympiakos vs Bayern Munich - 0-3
Bayern Munich vs D. Zagreb - 5-0
Arsenal vs Olympiakos - 2-3
20-10-2015: Arsenal vs B. Munich
20-10-2015: D. Zagreb vs Olympiakos
04-11-2015: B. Munich vs Arsenal
04-11-2015: Olympiakos vs D. Zagreb
24-11-2015: Arsenal vs D. Zagreb
24-11-2015: B. Munich vs Olym’kos
09-12-2015: D. Zagreb vs B. Munich
09-12-2015: Olympiakos vs Arsenal

Group G

	P	W	D	L	F	A	Pts
D. Kiev	2	1	1	0	4	2	4
Porto	2	1	1	0	4	3	4
Chelsea	2	1	0	1	5	2	3
Maccabi	2	0	0	2	0	6	0

Dynamo Kiev vs Porto - 2-2
Chelsea vs Maccabi - 4-0
Mac. Tel Aviv vs D. Kiev - 0-2
Porto vs Chelsea - 2-1
20-10-2015: Porto vs Maccabi
20-10-2015: D. Kiev vs Chelsea
04-11-2015: Maccabi vs Porto
04-11-2015: Chelsea vs D. Kiev
24-11-2015: Porto vs D. Kiev
24-11-2015: Maccabi vs Chelsea
09-12-2015: D. Kiev vs Maccabi
09-12-2015: Chelsea vs Porto

Group H

	P	W	D	L	F	A	Pts
Zenit SP	2	3	0	0	5	3	6
Valencia	2	1	0	1	3	3	3
Ghent	2	0	1	1	2	3	1
Lyon	2	0	1	1	1	2	1

Valencia vs Zenit SP - 2-3
Ghent vs Lyon - 1-1
Lyon vs Valencia - 0-1
Zenit SP vs Ghent - 2-1
20-10-2015: Zenit SP vs Lyon
20-10-2015: Valencia vs Ghent
04-11-2015: Lyon vs Zenit SP
04-11-2015: Ghent vs Valencia
24-11-2015: Zenit SP vs Valencia
24-11-2015: Lyon vs Ghent
09-12-2015: Valencia vs Lyon
09-12-2015: Ghent vs Zenit SP

Playing today

Group A
S. Donetsk vs PSG
Malmo vs R. Madrid

Standings: R. Madrid, Paris SG 3; Malmo, S. Donetsk 0.

Group B
CSKA Moscow vs PSV
Man. United vs Wolfsburg

Standings: PSV, Wolfsburg 3; Manchester United, CSKA 0.

Group C
Astana vs Galatasaray - 18.00
Atl. Madrid vs Benfica

Standings: Atletico Madrid, Benfica 3; Astana, Galatasaray 0.

Group D
B. M’gladbach vs Man. City
Juventus vs Sevilla

Standings: Sevilla, Juventus 3; Manchester City, B. M’gladach 0.