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Sweat drips from Spain's Rafael Nadal's face as he plays a VTR Open tennis match with Spain's Daniel Gimeno-Traver in Vina del Mar, Chile, Friday, Feb. 8, 2013. Nadal was putting himself through a twin workout on Friday to test his sore left knee, defeating fellow Spaniard Daniel Gimeno-Traver 6-1, 6-4 to reach the semifinals of the VTR Open. (AP Photo/Luis Hidalgo)
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