Rafael Nadal began his U.S. Open quarterfinal as poorly as possible, shut out in a set by a 6-0 score for only the fourth time in 282 career Grand Slam matches.
A break was in the air for Keys, and the first chances came at 2-3 15-40.
"I don't think we will have tons of long rallies".
He adds that he can't recall any attempts to alter court speeds at Flushing Meadows with the intention of helping American players.
But Millman asked Djokovic if he'd be OK with a delay after the fourth game.
Play resumed after about a six-minute delay.
Breaks were at a premium in the first set, both players holding serve until Suarez Navarro cracked at a decisive moment in the 10th game.
The Spaniard saved one set point by defending the net brilliantly but could do nothing about a crunching forehand victor from Keys on the second.
She has made it to the final four at three of the past five Grand Slam tournaments but is still seeking her first major championship.
Keys, who is also an Australian and French Open semifinalist, will face Japanese sensation Naomi Osaka for a spot in the decider.
"And this year I feel like I have been much more solid mentally, and in tougher times keeping my cool a little bit better and not having to have the big emotional swing to kind of try to get back into matches".
Novak Djokovic sweated it out from behind the baseline to beat Australian John Millman 6-3 6-4 6-4 and set up a semifinal with Japan's Kei Nishikori.
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This time, Keys will play No. 20 Naomi Osaka Friday for a chance to reach the final again.
She's still in search of major title No. 1. She would peak at No. 4 - the highest ever for an Italian woman - in 2011. "She know how to play".
The draw has been set for the 11th wheelchair tennis competition at the U.S. Open.
Nishikori missed last year's U.S. Open with torn tendons in his right wrist.
The competition runs from Thursday through Sunday with a total purse of $200,000.
But he broke back in the match's next-to-last game, then served out the victory at love. Should she want to break new ground at Slam level, the No. 30 seed will have to overcome an 0-3 head-to-head against the American. Cilic started well, taking the opening set and going up a break in the second.
Osaka becomes the first Japanese woman in a Grand Slam semifinal since Kimiko Date at Wimbledon in 1996.
The policy is a rule on the women's tour, but not the men's. The Osaka, Japan, native flew threw the quarterfinal round in less than an hour, beating Ukranie's Lesia Tsurenko 6-1, 6-1.
The 20-year-old Osaka said she was nervous, claiming to be "freaking out inside" - though it certainly never showed.
In the quarterfinals, Keyes met with the offender Maria Sharapova, Carla Suarez-Navarro.
Tsurenko didn't appear bothered by the conditions, but whether it was her health or just first-time jitters, she was off from the minute she stepped onto the court at Arthur Ashe Stadium.