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Argentina's River Plate midfielder Leonardo Ponzio (L) grimaces after getting reached by tear gas before the start of the second time of their Copa Libertadores 2015 round before the quarterfinals second leg football match against Argentina's Boca Juniors at the 'Bombonera' stadium in Buenos Aires, Argentina, on May 14, 2015. AFP PHOTO / JUAN MABROMATA (Photo credit should read JUAN MABROMATA/AFP/Getty Images)

Argentina's River Plate midfielder Leonardo Ponzio (L) grimaces after getting reached by tear gas before the start of the second time of their Copa Libertadores 2015 round before the quarterfinals second leg football match against Argentina's Boca Juniors at the 'Bombonera' stadium in Buenos Aires, Argentina, on May 14, 2015. AFP PHOTO / JUAN MABROMATA        (Photo credit should read JUAN MABROMATA/AFP/Getty Images)