AC Milan's Zlatan Ibrahimovic (L) and Arsenal's Alex Song fight for the ball during their Champions League round of 16 soccer match at the Giuseppe Meazza stadium in Milan. – Reuters Photo

AC Milan's Robinho (C) scores against Arsenal's goalkeeper Wojciech Szczesny (R) during their Champions League round of 16 soccer match at the Giuseppe Meazza stadium in Milan. – Reuters Photo

Arsenal's Johan Djourou (L) challenges AC Milan's Zlatan Ibrahimovic during their Champions League round of 16 soccer match at the Giuseppe Meazza stadium in Milan. – Reuters Photo

AC Milan's Zlatan Ibrahimovic (R) and Arsenal's Thierry Henry leave the field after their Champions League round of 16 soccer match at the Giuseppe Meazza stadium in Milan. – Reuters Photo

FC Barcelona's Alexis Sanchez celebrates a goal against Bayer Leverkusen during their Champions League soccer match in Leverkusen. – Reuters Photo

Bayer Leverkusen's Michal Kadlec (L) and Manuel Friedrich challenge FC Barcelona's Lionel Messi (R) during their Champions League soccer match in Leverkusen. – Reuters Photo

Andre Schuerrle (R) of Bayer Leverkusen challenges Eric Abidal of Barcelona during their Champions League round of 16 soccer match in Leverkusen. – Reuters Photo

Zenit St. Petersburg's Aleksandr Kerzhakov (R) fights for the ball with Benfica's Luisao during their Champions League last 16 first leg soccer match at the Petrovsky stadium in St. Petersburg. – Reuters Photo

Zenit St. Petersburg's Roman Shirokov (front) shoots to score the winning goal against Benfica during their Champions League last 16 first leg soccer matches at the Petrovsky stadium in St. Petersburg. – Reuters Photo

Zenit St. Petersburg's Tomas Hubocan (L) jumps to head the ball during their Champions League last 16 first leg soccer match against Benfica at the Petrovsky stadium in St. Petersburg. – Reuters Photo