The times are a changing in tennis -- and for those in charge of the sport it is a case of the quicker the better.
원문출처 : https://www.cnn.com/2018/05/16/tennis/tennis-shot-clock-rule-changes-atp-us-open/index.html
원문출처 : https://www.cnn.com/2018/05/16/tennis/tennis-shot-clock-rule-changes-atp-us-open/index.html