How to watch: ESPN, 11 a.m., Eastern time; ESPN2, 7 p.m.; streaming on ESPN+ and ESPN3, 11 a.m. Play begins at 11 a.m. on every court, except Ashe Stadium, where matches start at noon.

How to get there: Take the 7 subway line or the Long Island Rail Road to Mets-Willets Point.

Sunday’s schedule: Men | Women

Novak Djokovic, who has struggled with a sore left shoulder, looked in fine form on Friday night in his third-round match against Denis Kudla.

But Kudla is ranked 111th. Djokovic’s next opponent is Stan Wawrinka, who last played, and beat, Djokovic in the 2016 United States Open final. Wawrinka, a three-time major champion (beating Djokovic along the way each time), has struggled in recent years with injuries and has reached the quarterfinals in only one of his last seven Grand Slam tournaments. Djokovic, on the other hand, has won four of the last five majors he has played.

Wawrinka has not run into any significant competition through his first three rounds, and aside from his own shoulder, neither has Djokovic. These are tennis heavyweights meeting in the fourth round under the lights in the second night match at Arthur Ashe Stadium.

The winner will face the winner of the match between fifth-seeded Daniil Medvedev and the qualifier Dominik Köpfer (Armstrong Stadium, not before 5 p.m.). Medvedev became the villain of the Open for his behavior in his win over Feliciano López on Friday. The crowd will surely be against him again, and Köpfer is easy to root for — a 25-year-old qualifier who is ranked 118th and having the best Grand Slam performance of his career.