Juan Martin del Potro, Jo-Wilfried Tsonga reach semifinals in Shanghai

Updated: 11 October 2013 16:01 IST

Del Potro had 27 winners and only eight unforced errors in a 6-3, 6-3 win over Spain's Nicolas Almagro. Tsonga beat Germany's Florian Mayer 6-2, 6-3.

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