Wawrinka Downs del Potro to Reach U.S. Open Semi-Finals

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Third-seeded Stan Wawrinka defeated 2009 champion Juan Martin del Potro 7-6 (7/5), 4-6, 6-3, 6-2 to reach the semi-finals of the US Open in a Wednesday night match that trickled into Thursday.

Wawrinka, a two-time semi-finalist at Flushing Meadows, will face Kei Nishikori for a place in Sunday's championship match after the Japanese sixth-seed upset world number two Andy Murray 1-6, 6-4, 4-6, 6-1, 7-5.

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