Watch Monday's round of 16 highlights from Sony Open Tennis, featuring Serena Williams defeating Dominika Cibulkova 26 64 62, Li Na defeating Garbine Muguruza 76(6) 62, Aga Radwanska defeating Sloane Stephens 46 62 60 and Maria Sharapova defeating Klara Zakopalova 62 62.
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