LONDON // Ivan Perisic came off the bench to score a superb volley to deny Arsenal a win in their Champions League opener against the German champions Borussia Dortmund.
Robin van Persie's first-half goal for the Gunners looked the likely winner in their Group F tie, before Dortmund levelled with two minutes to go through Perisic's fine volley from outside the box.
The draw in Germany enabled Marseille to go top of the group after Lucho Gonzalez secured a 1-0 victory over Olympiakos.
The Argentine exploited a lapse in the Greek defence, meeting Jeremy Morel's cross before beating his former River Plate teammate Franco Costanzo in the Olympiakos goal.
Andre Villas-Boas, the Chelsea manager, oversaw a 2-0 victory over Bayer Leverkusen in Group E in his first Champions League match, while his former club Porto recovered to beat nine-man Shakhtar Donetsk 2-1 in Group G.
David Luiz eased growing tensions at Stamford Bridge midway through the second half. New signing Juan Mata then tucked away the second in injury time.
Racing Genk, the former club of the Al Jazira coach Franky Vercauteren, drew 0-0 with Valencia in the other Group E match.
Porto, last season's Europa League winners, had to thank their Brazilian strike force in their lively Group G encounter with Shakhtar.
Porto goalkeeper Helton gifted the Ukrainians the lead after 12 minutes, failing to hold Willian's weak shot from outside the area and spilling the ball for Luiz Adriano to tap in.
But striker Hulk equalised for Porto directly from a free-kick just before the half-hour mark and Kleber latched onto James Rodriguez's cross to poke in the host's winner six minutes after half-time.
Shakhtar lost their left-back Yaroslav Rakitskiy just before the half-time whistle for a studs-up challenge on Joao Moutinho and the centre-back Dmytro Chygrynskiy was shown his second yellow card in the 80th minute.
There was a first-ever Champions League win for Apoel Nicosia after second-half goals from Gustavo Manduca and Ailton secured a 2-1 win over Zenit St Petersburg.
All four teams in Group H are on one point after BATE Borisov and Viktoria Plzen drew 1-1 and AC Milan salvaged a point against the defending champions Barcelona in their 2-2 draw at Camp Nou.