Stanislas Wawrinka on brink of advancing
Stanislas Wawrinka, the No. 25 seed, is up 5-4 in the fifth set and is close to advancing to the quarterfinals.
Sam Querrey, the No. 20 seed, will be serving for his U.S. Open life.
The winner will play No. 12 seed Mikhail Youzhny.
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