Updated: October 23, 2013, 12:00 AM
In Pictures: Tuesday’s Champions League results
Arsenal 1-2 Borussia Dortmund. Arsenal were alone with six points in Group F, but after the loss they are joined by Dortmund and Napoli, who also won, at the top of the table. Dylan Martinez / Reuters
Schalke 0-3 Chelsea. Fernando Torres scored the first two of Chelsea's goals in a win that brought them to six points in Group E, equal to Schalke. Martin Meissner / AP
Milan 1-1 Barcelona. Lionel Messi returned and scored the equaliser for Barca in the 23rd minute. Alessandro Garofalo / Reuters
Milan 1-1 Barcelona. Kaka set up Robinho's ninth-minute goal which briefly put Milan ahead. The well-earned draw left the Serie A side with five points in Group H, good for second place behind Barca. Luca Bruno / AP
Vienna 0-3 Atletico. Diego Costa scored twice and Atletico maintained a 100 percent record in Group G. Heinz-Peter Bader / Reuters
Marseille 1-2 Napoli. Duvan Zapata, center, scored Napoli's second goal as the Serie A side ket pace with Arsenal and Dortmund in Group F. Boris Horvat / AFP
Porto 0-1 Zenit St Petersburg. Alexander Kerzhakov's 85th-minute goal gave the Russian side the victory. Rafael Marchante / Reuters
Porto 0-1 Zenit St Petersburg. Zenit fans celebrate the Russian side's ascendance to second place in Group G. With four points from three matches, they have one point more than Porto, in third. Francisco Seco / AP
Celtic 2-1 Ajax. Baram Kayal's 53rd-minute goal was the difference maker for the Scottish side, who earned their first Group H victory. Brian Stewart / EPA
Steaua 1-1 Basel. Already facing very long odds to advance, Bucuresti did Basel no favors by denying three points with an 88th minute equaliser from Leandro Tatu. A win would have put the Swiss side on par with Schalke and Chelsea at the top of Group E. Robert Ghement / EPA