Djokovic makes winning US return in Cincinnati as rival retires

The world number two, Novak Djokovic, advanced after winning the first set 6-4, when his Spanish opponent could not go on with a lower back injury.

source https://timesofindia.indiatimes.com/sports/tennis/top-stories/novak-djokovic-makes-winning-us-return-in-cincinnati-as-rival-retires/articleshow/102785940.cms