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A fan holds an Argentina flag prior to the second leg of the final match of Copa CONMEBOL Libertadores 2018 between Boca Juniors and River Plate at Estadio Santiago Bernabeu on December 9, 2018 in Madrid, Spain. Due to the violent episodes of November 24th at River Plate stadium, CONMEBOL rescheduled the game and moved it out of Americas for the first time in history. (Photo by Denis Doyle/Getty Images)