Del Potro upsets Nadal in Key Biscayne quarters
2009/04/02 18:26:00 @Sports News : CBSSports.com
Serena Williams has retained the No. 1 ranking by beating her sister in the semifinals at the Sony Ericsson Open. Earlier, Juan Martin del Potro ended men's world No. 1 Rafael Nadal's bid for his first Key Biscayne title.
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