So then, Rafael Nadal retires from the quarter finals of the Australian Open, hot on the heels of not playing at Wimbledon.  The reason? His knees.

Nadal’s knees have been a problem for years, as evidenced by the taping he has worn for a long time, and now it seems that they have had enough.  There are even articles that are talking about his retirement.

So how did this happen?  How does a super fit young bull of a man end up hobbling round like an octogenarian?
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