Danielle Collins shocked Garbine Muguruza 7-5 2-6 6-4 in a pulsating late-night encounter at the 2020 French Open.
The American, 26, performed well in the first set, dropped her intensity in the second set and then pounced when the Spaniard faltered in the decider.
Collins will face Ons Jabeur in the last 16. The entertaining Tunisian earned an upset of her own when she beat Aryna Sabalenka 7-6(7) 2-6 6-3.
Collins wins first-set hitting contest
The first set was very close-fought. After Muguruza secured an early break, Collins broke back to level the score at 2-2. Then for the rest of the set, both players put on an exhibition of power-hitting.
They matched each other up to 5-5. Then the American held to love to give herself a chance to swing freely against the Spaniard’s serve. She seized it with some huge strikes to wrestle the set away from Muguruza.
Although the World No.15 lost the set, she had every reason to feel puzzled about the outcome. She had a better winners to unforced errors ratio than Collins (14-8 versus 15-16) and she won most of her service games more easily than the American.
In essence, the World No.57 won the opening set courtesy of her ability to save break points with her powerful serve. Because of this, Muguruza only managed to convert one of her eight chances.
Muguruza storms back
To her immense credit, Muguruza remained completely calm and never let the destination of the first set bother her.
The Spaniard stepped out and produced a near-flawless display in the second set. She cracked 11 winners and made just four unforced errors as she broke Collins in the first and fifth games and claimed the set 6-2 in just 33 minutes.
Collins pounces as Muguruza falls away
Muguruza maintained her momentum at the start of the decider. She broke Collins in the opening game for the third consecutive set. Then she staved off two break points during a battling hold that made it 2-0.
In game three, the Spaniard hit two excellent winners to go 0-30 up on the American’s serve. Then Collins made an unforced error on break point.
Muguruza offered the World No.57 a glimmer of hope when she made some sloppy errors to hand her a break. Buoyed by this, the American began to compete more effectively, and the following three tight games were all eventually won by the server to make it 4-3 to the Spaniard.
Then Muguruza faltered again. She served poorly and Collins broke her again to level the score. And the American followed it with a hold to love to pile pressure on the Spaniard.
Surprisingly, the 2016 champion crumbled. She hit two double faults during her worst service game of the match to hand victory to the American.
Kvitova survives but Ostapenko departs
Petra Kvitova fought back from 5-1 down in the opening set to beat Leylah Fernandez 7-5 6-3 and book her place in the fourth round at Roland Garros for the first time since 2015.
The Czech, 30, made a host of unforced errors in the first six games. Meanwhile, the teenage Canadian, who won the junior French Open title last year, started very brightly.
Unfortunately for the 18-year-old, Kvitova drew on all her experience to storm back and take the first set. Then she won the second set relatively easily. The Czech will now face Zhang Shuai in the last 16. The Chinese player beat French wildcard 7-6(2) 7-5.
By contrast, Jelena Ostapenko turned in the kind of performance viewers have become accustomed to during her slide down the rankings.
The Latvian, 23, made 10 double faults and 43 unforced errors during 82 painful minutes on court. Accordingly, she lost 6-4 6-3 to main draw debutant Paula Badosa, who played well throughout.
It was a remarkable win for the Spaniard, 22, who had already achieved her best result at a Grand Slam by reaching the third round. She will now take on another surprise package in the last 16 in the shape of Laura Siegemund. The German upset 13th seed Petra Martic 6-7(5) 6-3 6-0.
Kenin hurries through
Sofia Kenin charged into the last 16 of the French Open courtesy of a 6-2 6-0 victory over Irina Bara that took her just 72 minutes to achieve.
The American, 21, required three sets to win in rounds one and two. But she had no such trouble this time. She sealed a fourth meeting with Fiona Ferro, one of nine unseeded players in the last 16.
The Frenchwoman, 23, is enjoying comfortably the best year of her career so far. And she added another highlight when she overcame Patricia Maria Tig 7-6(7) 4-6 6-0.