Roger Federer has pulled out of this year's French Open after undergoing knee surgery.
원문출처 : https://www.cnn.com/2020/02/20/tennis/roger-federer-knee-injury-french-open-spt-intl/index.html
원문출처 : https://www.cnn.com/2020/02/20/tennis/roger-federer-knee-injury-french-open-spt-intl/index.html