American tennis prodigy Cori Gauff is only 13 years old but she already has Serena Williams' long-time coach by her side.
원문출처 : http://www.cnn.com/2017/11/28/tennis/cori-gauff-serena-williams/index.html
원문출처 : http://www.cnn.com/2017/11/28/tennis/cori-gauff-serena-williams/index.html