The ball rebounds off Porto's Spanish goalkeeper Iker Casillas (3R) as he saves a shot from Chelsea's Brazilian-born Spanish striker Diego Costa (2R) to hit Porto's Spanish defender Ivan Marcano (L) and ricochet into the goal for an own goal during the UEFA Champions League Group G football match between Chelsea and Porto at Stamford Bridge in London on December 9, 2015. AFP PHOTO / GLYN KIRK / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP/Getty Images)
