US Open at a glance -- day 9

US Open at a glance -- day 9:

Headlines

+ Nadal downs Thiem in five-set epic

+ Serena into 12th US Open semi-final

+ Del Potro into third New York semi-final

+ Isner defeat ends US hopes of first men's champion in 15 years

+ Play suspended for two hours in juniors due to extreme heat

Results

-- Rafael Nadal (ESP x1) bt Dominic Thiem (AUT x9) 0-6, 6-4, 7-5, 6-7 (4/7), 7-6 (7/5)

-- Serena Williams (USA x17) bt Karolína Plíšková (CZE x8) 6-4, 6-3

-- Juan Martin Del Potro (ARG x3) bt John Isner (USA x11) 6-7 (5/7), 6-3, 7-6 (7/4), 6-2

-- Anastasija Sevastova (LAT x19) bt Sloane Stephens (USA x3) 6-2, 6-3

Sidelines

Perfect headline

-- The New York Post took the plaudits for one of the best headlines marking John Millman's shock win over Roger Federer on Monday night.

It's sports pages carried the headline: "One in a Millman."

No comfort break for del Potro

-- Juan Martin del Potro wanted to dash from the court to change his shorts and go to the barthroom after three games of the second set against John Isner but was told by the umpire there wasn't enough time.

"I'll be back in 90 seconds," pleaded 2009 champion Del Potro to no avail.

Practice makes perfect for Sevastova

-- There's no rest for US Open semi-finalist Anastasija Sevastova who will prepare for Thursday's last-four clash by playing doubles on Wednesday with Russian partner Anastasia Pavlyuchenkova.

"I'm going to play doubles tomorrow. That's my preparation," said the Latvian.

Sloane sick of the heat

-- Defending champion Sloane Stephens, knocked out by Sevastova, blamed the 33-degree heat as well as illness for contributing to her loss.

"I have been sick since Monday. Bad sinus infection. Whatever. You've got to play," admitted the world number three.

Who's saying what

"I'm sorry."

-- Rafael Nadal's words to Dominic Thiem after winning their quarter-final.

"I had a shower, lay on the table and I didn't want to come back again. It was too hot to play tennis."

-- Juan Martin del Potro on his 10-minute heat break

"I've never seen Roger sweat so much."

-- John Isner on the humidity even affecting Roger Federer at the US Open

"I didn't expect to receive a trophy after losing in the quarter-finals."

-- Isner on receiving the tournament's sportsmanship award