U.S. Open R1 previews and predictions: Federer vs. Nagal, Wawrinka vs. Sinner
Swiss stars Roger Federer and Stan Wawrinka will help get the U.S. Open started when they take the court on Monday. Both are going up against qualifiers, as Federer faces Sumit Nagal and Wawrinka meets the more heralded Jannik Sinner.
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