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How to watch: From 11 a.m. to 11 p.m. Eastern time on ESPN2; streaming on the ESPN app.
On Sunday, the severely thinned ranks of the singles draw will begin the fourth round of the United States Open with 75 percent of the field knocked out. While some of the betting favorites are still cruising, there are plenty of speed bumps to overcome as the knockout format causes players on hot streaks to collide.
Here are some matches to keep an eye on.
Because of the number of matches cycling through courts, the times for individual matchups are best estimates and are certain to fluctuate based on the completion times of earlier play.