For Roger Federer it was one of those few occasions when a final got away from him.
원문출처 : http://www.cnn.com/2017/09/05/tennis/roger-federer-martin-del-potro-us-open/index.html
원문출처 : http://www.cnn.com/2017/09/05/tennis/roger-federer-martin-del-potro-us-open/index.html