In the remarkably unpredictable 2009 US OPEN,the 20 year old Juan Martin del Potro's shocking come from behind victory over Roger Federer surely ranks as the unlikeliest of outcomes.

Not to mention one of the greatest upsets in tennis history.

In the first grand slam final, 6th ranked del Potro upstart from Argentina dethroned Roger Federer, reigning king of  flushing Meadows who 'd won five straight crowns here,in a tense and thrilling five set final.

Federer looked to be in position to cap his...
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