How to watch: ESPN2, 11 a.m.; streaming on ESPN+ and ESPN3, 11 a.m.

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

Monday’s schedule: Men | Women

In her first three matches, No. 1 Naomi Osaka has brushed aside concerns surrounding her injured knee in the early stages of the tournament, dropping only one set. On Saturday night, she easily pushed past Coco Gauff, the 15-year-old who has captured the world’s attention with stellar runs at Wimbledon and the United States Open.

Osaka will need to defend her title in order to retain the No. 1 ranking, if she fails to do so, Ashleigh Barty, who lost Sunday in the round of 16 to Wang Qiang, will reclaim the title.

Standing in Osaka’s way Monday is Belinda Bencic, the No. 13 seed (Arthur Ashe Stadium, noon). Bencic will be the first seeded player that Osaka has faced in the tournament and has beaten Osaka twice this year. Bencic, who received a walkover in the third round after Anett Konteveit pulled out with an illness, modeled her game on Martina Hingis and was even coached by Hingis’s mother. Bencic’s ability to take the ball on the rise can be a useful weapon in trying to neutralize Osaka’s powerful baseline game.

ASHE STADIUM

Alexander Zverev vs. Diego Schwartzman

After the Osaka-Bencic match, the sixth-seeded Zverev will take the court. The winner of the 2018 ATP Finals, Zverev has struggled to prove this year that he is capable to break through the oligarchy of the Big Three. After he lost in the first round at Wimbledon, being able to power through to the round of 16 at the Open is a positive sign. But he has not yet faced a seeded player, and needed five sets to secure victories twice in the first three rounds. Schwartzman, the No. 20 seed, needed only three sets in each of his matches to reach the fourth round. His excellent return of serve will challenge Zverev’s ambitions to make a deeper run at the Open.