And in the final she will meet world number five Jelena Ostapenko after the French Open champion saw off plucky American qualifier Danielle Collins 7-6 (7/1), 6-3. The Belarusian athlete lost to Sloane Stephens - WTA's No.12.
That was Stephens' mantra when her U.S. Open championship past year was followed by eight consecutive losses, a staggering, frustrating and nearly inexplicable freefall.
Victoria Azarenka will play US Open champion Sloane Stephens in the other women's singles semi-final.
Earlier, sixth seed Ostapenko was far from her best in her quarter-final, spraying the court with 44 unforced errors and having her serve broken six times on a windy day.
She won and was interviewed right after the match in front of the bleachers, close enough for the fans to listen in. You know, she's gonna jump on it.
Ostapenko survived a nail-biter she probably should have lost to Canadian qualifier Françoise Abanda in the second round at Wimbledon on her way to a very respectable quarterfinal finish there a month after her French Open run.
When she will play again is unclear.
Azarenka, still working back up the rankings following the birth of her son late in 2016, entered this event ranked No. 186.
"I was hurting a little bit today, but it was on and off all the time", Svitolina said afterwards. "To make the progress from one week to another week, barely practicing and barely even eating, not too bad". "And if I win the match, I win the match and it's awesome".
Alexander Zverev and Borna Coric were about an hour and 15 minutes late getting started (Zverev prevailed, 6-4, 6-4).
"It's ideal conditions", said Isner, who lost to Novak Djokovic in the 2015 semi-finals at Key Biscayne. It was encouraging to see that Stephens was able to win without playing her best tennis.
Rust, she said, was partly a factor.
Years ago, Stephens was going through qualifying in order to achieve the privilege of making the main field in the Miami Open.
For the Fort Lauderdale native, this South Florida tournament means something special. What's going to be here?
"It's weird, what's going to happen to Crandon Park". Stephens said. "There's so many questions".
"I think they kind of went through the same thing, and so that really resonates with me a lot".