Ashleigh Barty will return to the top of the WTA rankings after the US Open following Naomi Osaka's defeat to Belinda Bencic.
For Novak Djokovic, losing ground in his pursuit of the grand slam singles titles record will sting more than his injured shoulder.
Despite having an idea he was playing a wounded Novak Djokovic, Stan Wawrinka was still surprised by his opponent's retirement in New York.
After ending his US Open defence prematurely, world number one Novak Djokovic spoke of the pain he has dealt with in his left shoulder.
Stan Wawrinka was in command against Novak Djokovic when the defending champion retired at the US Open.
World number one Novak Djokovic saw his US Open defence end as he retired in the third set against Stan Wawrinka.
Her compassion for Coco Gauff won widespread plaudits, and Naomi Osaka should now be a firm fan favourite at the US Open.
The US Open fined Mike Bryan for unsportsmanlike conduct following a gesture he said was meant to be playful.
An ankle scare marked Serena Williams' fourth-round win at the US Open, where Ashleigh Barty and Karolina Pliskova were beaten.
A win over Petra Martic for Serena Williams was marked by her turning her ankle in the second set, though she moved to calm the concern.