Today, we throw back to the twin of last week's Federer-Del Potro US Open quarter-final clash. Almost everything discernible is the same in both matches, except that the older twin is eight years older, and a more epic one. Watching this match would allow one to put last week's encounter into greater perspective, and to discern better the reasons for Federer's loss. If you want to answer the question 'Why is Del Potro so dangerous to Federer?', this a match not to be missed.
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