Rafael Nadal pulls out of next week 's event in Buenos Aires . World No . 1 says back problems prevented him from training on Thursday . Nadal played through the pain barrier in the final in Melbourne , saying afterwards that he would never want to quit a grand slam final . He has not played since a back injury plagued him in January 's Australian Open final .
Rafael Nadal pulls out of next week 's event in Buenos Aires . World No . 1 says back problems prevented him from training on Thursday . He has not played since a back injury plagued him in January 's Australian Open final .