A Serena Williams-Li Na semifinal will be a mental test for both

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Li Na fell in straight sets to Serena Williams earlier this year at the West and Southern Open in Cincinnati.

Li Na fell in straight sets to Serena Williams earlier this year at the West and Southern Open in Cincinnati.

Throughout this U.S. Open Williams has remained poised and focused, staring down opponents as if she were a world-class heavyweight champ looking to defend her title. Come to think of it, that's exactly what she is.