Perhaps, the defeat to Stephens at the US Open a year ago still haunted her. Sevastova had gone down to the American 6-3, 3-6, 7-6 in the last eight in 2017.
"When you don't play big points well, the match can get away from you". It was just a tough day.
For a spot within the semi-finals of the event, Stephens will compete with the tennis participant from Latvia Anastasiya Sevastopol, which is within the fourth spherical beat Ukrainian Elina Svitolina.
"I hope that I can go to Asia and win some more matches and hopefully make the year end and hopefully keep going as far as I can".
Sevastova said: "It was very physical today, it was tough to play, it's so hot". "If you were to play the same people in a row again and beat all of them again, that would be defending your title".
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She will play the victor of Tuesday's night match between Serena Williams and Karolina Pliskova in the last four.
The 28-year-old Sevastova, who avenged last year's quarter-final loss to Stephens in NY to reach her first Grand Slam semi-final, converted five of her eight break points and saved seven of the nine against her.
She earned the last of five breaks in the second set to take a 5-3 lead and served it out on her third match point when a tired Stephens put a backhand into the net.
"You have to appreciate it more", she said.
"When the shade was there it was so hot here and awesome there", Sevastova said of the contrast of playing on the shady or sunny end of the court. "Maybe the top 100".
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The 14th-seeded Keys will play Carla Suarez Navarro who ended Maria Sharapova's flawless record in night matches at the U.S. Open final - or No. 10 David Goffin . 'I felt like a bit of a deer in the headlights to begin with, my feet weren't moving.
"It was an fantastic journey, this three, four years".
Sevastova on the way to the first semi-final in his career at the Grand slam tournament has served 2 aces, made 1 double fault, sold 5 out of 8 break points, committed 18 winnershow and made 28 unforced errors. It's back to the drawing board for the number 3 player and onto the next tournament be it in Chicago, Quebec City, onto the Asian Swing, the WTA Finals or others.
"You think, 'Oh, but in the end it's awesome, yeah?' You can't believe, yeah".
"The last games, it was good that I played in the shade". You can't believe. So, after I stop, at some point I will look at it and I will be proud of myself, for sure. "I think she lost also her nerves a little bit, it's normal". Past year he lost a very tough match against Del Potro here.
She then dropped her racket and held her hands to her face as a Stephens shot went into the net on the match's final point.
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The German tactician said he expected the mistake but urged his players to stop putting their goalkeeper in hard situations. But he did it. "Then it's games, games, games and the whole of September - I don't know how many , but a lot".