Serena Williams: the US Open meltdown -- what the officials are saying

Juan Martin del Potro set up a US Open final clash against Novak Djokovic on Friday after defending champion and world number one Rafael Nadal quit his last-four clash against the giant Argentine with a knee injury.

A weary and wounded world number one Rafael Nadal retires from his U.S. Open semi-final while trailing Juan Martin del Potro 7-6(3) 6-2, sending the Argentine back to the Flushing Meadows final for the first time since his 2009 triumph.

Six-time champion Serena Williams swept aside Anastasija Sevastova Thursday to reach a ninth US Open final, where she'll face Japanese trail blazer Naomi Osaka.

Novak Djokovic sweated it out from behind the baseline to beat Australian John Millman 6-3, 6-4, 6-4 at the US Open on Wednesday and set up a semifinal with Japan's Kei Nishikori.

Defending champion Rafa Nadal failed to win a single game in the opening set of his US Open quarterfinal against Dominic Thiem on Tuesday but fought back to beat the Austrian 0-6, 6-4, 7-5, 6-7(4), 7-6(5) in a match that ended after 2:00am in New York.

Defending champion Rafa Nadal failed to win a single game in the opening set of his U.S. Open quarter-final against Dominic Thiem on Tuesday but fought back to beat the Austrian 0-6 6-4 7-5 6-7(4) 7-6(5) in match that ended past 2 a.m. in New York.

Juan Martin del Potro reaches the US Open semifinals for the third time, defeating John Isner 6-7 (5/7), 6-3, 7-6 (7/4), 6-2 and ending American hopes of a first men's champion at the event since 2003.

Roger Federer and Maria Sharapova crashed out of the US Open on Monday in back-to-back seismic shocks under the Arthur Ashe Stadium lights.

Sloane Stephens's US Open title defense ended with a 6-2, 6-3 quarterfinal defeat to Anastasija Sevastova on Tuesday as the Latvian avenged a 2017 loss to the American at the same stage.

Novak Djokovic does his part to set up a blockbuster quarterfinal clash with Roger Federer at the US Open with a 6-3, 6-4, 6-3 victory over unseeded Joao Sousa.

Defending champion Rafael Nadal on Sunday reached the US Open quarterfinals for the eighth time where he will face Dominic Thiem, one of only three men to defeat him in 2018.

Defending champion Rafael Nadal reaches the US Open quarter-finals for the eighth time where he will face Dominic Thiem, one of only three men to defeat him in 2018.

An out-of-sorts Alexander Zverev was dumped out of the US Open third round on Saturday by compatriot Philipp Kohlschreiber in four

Five-time champion Roger Federer found a new way to amaze as he reached the US Open last 16 with a 6-4, 6-1, 7-5 victory over Nick Kyrgios.

Madison Keys, vying to return to the US Open final, was back in the last 16 after a 4-6, 6-1, 6-2 victory over Aleksandra Krunic on Saturday.

World No. 1 and defending champion Rafael Nadal came back from a set and break down to defeat Karen Khachanov 5-7, 7-5, 7-6 (9/7), 7-6 (7/3) to reach the US Open fourth round Friday.

Serena Williams roars through her 30th career meeting with her sister Venus to book a US Open fourth-round berth with a 6-1, 6-2 victory.

World number one and defending champion Rafael Nadal came back from a set and break down to defeat big-hitting Karen Khachanov 5-7, 7-5, 7-6 (9/7), 7-6 (7/3) and reach the US Open fourth round on Friday.

Defending champion Sloane Stephens reached the US Open fourth round on Friday, winning the last three games in a straight-sets victory over Victoria Azarenka after a brief break to close the Arthur Ashe Stadium roof.