Boca Juniors’ highly anticipated clash with bitter rivals River Plate has been called off amid torrential rain in Buenos Aires. The Copa Libertadores final first-leg will now be played on Sunday at 7pm UK time. The pitch at Boca’s famous La Bombonera has fell foul of the extreme conditions and officials have ruled the waterlogged pitch unplayable. Fans had already begun to arrive for the biggest clash in South American football – the continent’s equivalent of the Champions League. CONMEBOL president Alejandro Dominguez this week dubbed the two-legged showdown as the biggest in almost six decades. He said: “There’s never been a final like this in 58 years.” To put it in perspective, it’s like Celtic and Rangers meeting in a European final. But fans will now be forced to wait as huge puddles built up on the pitch throughout Saturday. With the flooding looking alarmingly heavy, doubts remain over whether the pitch will be playable on Sunday.