Images from Tuesday's Champions League matches
Arsenal and Barcelona among the clubs in action
Zenit's Aleksandr Kerzhakov, right, and Atletico's Miranda, left, struggle for the ball during the Champions League group G soccer match between Zenit and Atletico Madrid at Petrovsky stadium in St.Petersburg, Russia, on Wednesday, Nov. 27, 2013.Dmitry Lovetsky/The Associated Press
Arsenal's Olivier Giroud, left, is challenged by Olympique Marseille's goalkeeper Steve Mandanda during their Champions League soccer match at the Emirates stadium in London November 26, 2013.Reuters
Zenit St Petersburg's Vladimir Bystrov tackles Atletico Madrid's Emiliano Insua during their Champions League soccer match at the Petrovsky stadium in St. Petersburg November 26, 2013.ALEXANDER DEMIANCHUK/Reuters
Napoli's goalkeeper Pepe Reina saves a shot by Borussia Dortmund's Henrikh Mkhitaryan as Robert Lewandowski watches during their Champions League group F soccer match in Dortmund November 26, 2013.Reuters
Atletico Madrid's Juanfran, left, fights for the ball with Zenit St Petersburg's Oleg Shatov during their Champions League soccer match at the Petrovsky stadium in St. Petersburg November 26, 2013.ALEXANDER DEMIANCHUK/Reuters
Borussia Dortmund's supporters wave flags ahead of the Champions League group F soccer match against Napoli in Dortmund November 26, 2013.KAI PFAFFENBACH/Reuters
Chelsea's Petr Cech saves a free kick from Basel during their Champions League Group E soccer match at St. Jakob-Park in Basel November 26, 2013.ARND WIEGMANN/Reuters
Arsenal's Jack Wilshere celebrates after scoring a goal against Olympique Marseille during their Champions League soccer match at the Emirates stadium in London November 26, 2013.EDDIE KEOGH/Reuters
Borussia Dortmund's Sven Bender has a bleeding nose during their Champions League group F soccer match against Napoli in Dortmund November 26, 2013.INA FASSBENDER/Reuters
Vienna's Roman Kienast, left, celebrates with Vienna's Daniel Royer after scoring the opening goal during the Champions League group G soccer match between FC Porto and Austria Vienna Tuesday, Nov. 26, 2013, at the Dragao stadium in Porto, northern Portugal.Paulo Duarte/The Associated Press
FC Basel's Kay Voser gets in a tangle with Chelsea's Cesar Azpilicueta during their Champions League Group E soccer match at St. Jakob-Park in Basel November 26, 2013.RUBEN SPRICH/Reuters
Borussia Dortmund's Jakub Blaszczykowski fights for the ball with Napoli's Dries Mertens during their Champions League group F soccer match in Dortmund November 26, 2013.KAI PFAFFENBACH/Reuters
Arsenal's Jack Wilshere, right, challenges Olympique Marseille's Giannelli Imbula during their Champions League soccer match at the Emirates stadium in London November 26, 2013.EDDIE KEOGH/Reuters
Borussia Dortmund's Marco Reus scores a goal on penalty against Napoli's goalkeeper Pepe Reina during their Champions League group F soccer match in Dortmund November 26, 2013.INA FASSBENDER/Reuters
Schalke's Christian Fuchs, right, vies for the ball with FC Steaua Bucharest's Adrian Popa, left, during their Champions League Group E soccer match, at the National Arena in Bucharest, Romania, Tuesday, Nov. 26, 2013.Vadim Ghirda/The Associated Press
Arsenal's Olivier Giroud, right, challenges Olympique Marseille's goalkeeper Steve Mandanda during their Champions League soccer match at the Emirates stadium in London November 26, 2013.DYLAN MARTINEZ/Reuters
FC Schalke's Adam Szalai, right, vies for the ball with Bucharest's Alexandru Chipciu, left, during their Champions League Group E soccer match, at the National Arena in Bucharest, Romania, Tuesday, Nov. 26, 2013.Vadim Ghirda/The Associated Press