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Li sets up Williams last eight clash

Li Na of China (L) shakes hands at the net after her straight set victory against Garbine Muguruza of Spain during their fourth round match at the Sony Open at Crandon Park Tennis Center on March 25, 2013, in Key Biscayne, Florida. Li won 7-6 (8/6), 6-2.China's Li Na reached the quarter-finals of the Miami Masters here on Monday with an error strewn 7-6 (8/6), 6-2 win over giantkilling Spanish teenager Garbine Muguruza.