Much has been made of the resurgence of Roger Federer and Rafael Nadal this season.
원문출처 : http://www.cnn.com/2017/09/15/tennis/martina-hingis-interview-us-open-25-grand-slams-doubles/index.html
원문출처 : http://www.cnn.com/2017/09/15/tennis/martina-hingis-interview-us-open-25-grand-slams-doubles/index.html