Eight is Enough

The final eight matches are set for this year's US Open.
They are: (winners highlighted)

Raphael Nadal vs. Sam Querry
Andy Murray vs. Stan Wawrinka
Juan Martin del Potro vs. Kei Nishikori
Gael Monfils vs. Mardy Fish

(Tuesday matches)

Roger Federer vs. Igor Andreev
Andy Roddick vs. Fernando Gonzalez
Tommy Robredo vs. Novak Djokovic
Nikolay Davydenko vs. Gilles Muller