PARIS (AFP) - Arsenal manager Arsene Wenger and Chelsea striker Fernando Torres enjoyed differing fortunes on the former's 64th birthday and the latter's 100th start for Chelsea in Champions League action on Tuesday.
Arsenal went down to their first defeat since the opening day of the Premier League campaign, as last season's beaten finalists Borussia Dortmund beat them 2-1 at the Emirates Stadium.
Olivier Giroud cancelled out Henrikh Mkhitaryan's opener before Polish striker Robert Lewandowski scored the winner, although he was fortunate to be on the pitch having elbowed Laurent Koscielny earlier in the second half.
After three rounds of games, Dortmund top the Group F table on goal difference from Arsenal, while Napoli also joined them on six points after disposing of Marseille 2-1 in France.
Arsenal's English rivals Chelsea enjoyed better fortune against German opposition as a double from Torres - taking his tally to 39 for the London club - and one from Eden Hazard saw them to a 3-0 win and inflict a first defeat of the campaign on Schalke 04 in Group E.
Both Chelsea and Schalke are on six points while Basel, surprise winners over Chelsea in the first match, are on four points after being held 1-1 by previously pointless Steaua Bucharest in Romania.
Steaua scored a late equaliser but have now gone a record 12 home matches without a win in the competition.
The night's highest profile match ended in a 1-1 draw in Italy between AC Milan and Barcelona as Argentina's four-time world player of the year Lionel Messi showed he had put behind him the thigh injury that kept him out for three weeks with a fine equaliser.
That goal cancelled out Robinho's opener but, despite dominating the second half, Barcelona were unable to break down an obdurate Milan defence and dropped their first points of the campaign.
They top Group H with a two-point advantage over Milan while Celtic kept their hopes alive of reaching the Last 16 for the second successive season with a 2-1 win at home to Ajax, which sees the Scottish champions move onto three points at the halfway stage.
Atletico Madrid had no trouble in making it three wins from three as they rebounded from their first league defeat of the season at the weekend to trounce Austria Vienna 3-0 away in Group G.
A double from Brazil-born striker Diego Costa - one a magnificent solo run from the halfway line - on his return from a European ban was the foundation of their victory.
They can wrap up their place in the knockout stages should they beat the same opponents in early November as they lead Zenit St Petersburg by five points and third-placed Porto by six.
Zenit ran out 1-0 winners over a Porto side that played with just 10 men from the sixth minute when Hector Herrera was sent off and Aleksandr Kerzhakov struck the winner shortly before full time in Oporto.
