Sharapova, the 2006 US Open victor, was able to find the positives after making 51 unforced errors to only 14 by Sevastova, whose 21 winners were half the 30-year-old Russian's total.
She was pushed all the way here by Kvitova in a captivating duel, eventually prevailing 6-3 3-6 7-6 (7/2) in a deciding tie-break after two hours and 35 minutes.
Stephens' body is more than holding up.
The 27-year-old, who next faces Venus Williams, insisted she will continue to play with no expectations but also without being surprised by what she can still produce. She is two steps away from reaching her third Grand Slam final of the season.
Asked about some of the remarkable comeback stories which this tournament has produced, Williams said: "I think sport is a little microcosm of life".
Against Williams, Kvitova worked the angles pretty well with her crafty left hand, but she lacked consistency and the American was never threatened in the final tiebreak. "Fortunately, I found the serve at the end of the third set but, yeah, I had the break in the third and unfortunately, I gave it back to her". "I wanted to be doing something about my future".
"The first set was very close and could have gone either way", Sevastova, who hit 21 winners, said of the match with Sharapova.
Now ranked 83rd in the world, Stephens will also climb back into the world's top 40 at the end of the tournament, this coming after she launched her comeback from a foot injury at Wimbledon ranked in the 900s. "He played during a time where he couldn't just focus on the tennis". Kvitova finished her 2016 season with a flurry of success in the fall, winning the Wuhan Open for a second time and capping off her season with the title at the WTA Elite Trophy Zhuhai.
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"I think Venus is just our leader", Stephens said of the relationship between the American players. "I think as a whole, she's just like what everyone looks up to". And she is very gracious in giving credit to others, particularly her sister Serena and her opponents. Even more so when she had a point for a 4-2 lead.
Venus Williams reached her 23rd Grand Slam semi-final with a thrilling win over Petra Kvitova in a final-set tie-break.
Spanish combination of Feliciano and Marc Lopez made their way through to the semifinals of Men's doubles at US Open after defeating the Dutch duo of Robin Haase and Matwe Middelkoop 6-4, 7-5 in straight sets in their quarterfinal match.
Venus Williams, her self, admitted this fact.
"(It) definitely felt like a special match", Venus commented. She sprayed a second serve four feet long then failed in her effort to squeeze a forehand down the line, gifting back the break at 15.
If you're a parent looking for role models for your daughters, and the reality stars that dominate television and social media aren't exactly what you have in mind, look no further than the women playing their hearts out on center stage at the Billie Jean King USTA National Tennis Center. "I hope that we keep it going".
"I am focused on myself and being as aggressive as possible".
Now she has entered the semifinals of US Open. "Luckily I find it in a Grand Slam, which is nice".