A straight-sets win over Petra Martic potentially came at a cost for Serena Williams, who rolled her right ankle in the second set.
Only 72 minutes were required for Roger Federer to beat David Goffin and progress to the US Open quarter-finals.
Defending champion Naomi Osaka was eager to show her support for Coco Gauff, following their third-round match at the US Open in New York.
There were very contrasting days for Rafael Nadal and Alexander Zverev at the US Open, but both are safely into the second week.
After initially wanting to leave the court after her heavy defeat, Coco Gauff was glad Naomi Osaka convinced her to stay for an interview.
Naomi Osaka did not want Coco Gauff to leave the court sad after their US Open clash, hence her decision for them to have a joint interview.
Naomi Osaka claimed her US Open third-round match with Coco Gauff and will have won plenty of hearts with her conduct afterwards.
Coco Gauff saw her US Open campaign ended by Naomi Osaka, who looked every inch a player ready to defend her title.
Rafael Nadal was quizzed on his diet after beating Hyeon Chung at the US Open, revealing he is not a fan of cheese.