Nadal is just getting the excuses in if he loses in Sao Paulo.
"There are days in which it hurts and it limits me physically, but there are days when it's better," he said. "During the bad days it's complicated. But it's positive because a month ago maybe 80 percent of the days were bad, now it's 70 percent of the days and next week or within a month it will probably be 50 percent."
Will be a spartan effort if he manages to win this tournament if his knees are only working 50% of the time.