Lionel Messi of FC Barcelona (R) and Mats Hummels of Borussia Dortmund are seen in action during the UEFA Champions League match between Borussia Dortmund and FC Barcelona at the Signal Iduna Park in Dortmund. (Final score; Borussia Dortmund 0:0 FC Barcelona) (Photo by Osama Faisal / SOPA Images/Sipa USA)