/https%3A%2F%2Fsportsmole-media-prod.s3.gra.io.cloud.ovh.net%2F11%2F31%2Fgaelmonfils_20110625.jpg "Monfils through to Washington semi")
Frenchman Gael Monfils is through to the semi-final stage of the Legg Mason Tennis Classic in Washington.
Top seed Monfils saw off sixth seed Janko Tipsarevic 6-4 6-4 in the quarter-finals to advance.
Monfils will now play American John Isner after the 11th seed beat Viktor Troicki 7-6 (7-5) 3-6 6-1.
Donald Young will take on Radek Stepanek in the other semi-final.
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