Serena Williams' quest for a 24th grand slam singles title at the US Open remains alive after she came from a set down to defeat Sloane Stephens in the third round.
Williams' form coming into the tournament offered little encouragement for her supporters but she has stepped up her game on the big stage so many times that it was no surprise to see her among the title favourites anyway, particularly with six of the top 10 missing.
She won her first two matches in straight sets but this was always going to be a bigger test, and it was one she looked unlikely to pass in a first set that was dominated by 2017 champion Stephens.
But Williams, who turns 39 later this month, changed things around in the middle of the second set and ended a 2-6 6-2 6-2 victory with her prospects significantly enhanced.
"It was intense. We always have some really incredible matches. It brings out the best in my fitness when I play Sloane," Williams said.
"In that first set I don't think she made any errors. I just said I don't want to lose in straight sets. I just said get a game and next thing I know I won the second set."
In the last 16, Williams will face Greek 15th seed Maria Sakkari, who was impressive in a 6-3 6-1 victory over Amanda Anisimova.
The 2020 Australian Open winner and second seed Sofia Kenin overcame a sluggish start to surge past Tunisia's Ons Jabeur 7-6 (7-4) 6-3 to move into the fourth round of the US Open for the first time.
Jabeur, ranked 31 in the world, broke to take a 4-2 lead in the opening set as Kenin struggled to control her serve.
But the American immediately responded with a break of her own before grabbing the early advantage in the contest via the tiebreak.
Kenin, who swatted aside Jabeur en route to her Australian Open title and came into the clash at Louis Armstrong Stadium with a 4-1 record over her, switched gears at the start of the second set to tighten the screws on her opponent.
There were times when Tsvetana Pironkova thought she had played her last top-level tennis match after taking a break from the tour in 2017 but the Bulgarian has surprised herself with a run to the last without dropping a set.
The 32-year-old, who gave birth to son Alexander in 2018, eased past Croatian 18th seed Donna Vekic 6-4 6-1 to reach the second week at Flushing Meadows for the second time.
Playing her first professional tournament since Wimbledon 2017, Pironkova used her special ranking after maternity leave to enter the main draw in New York.
Elise Mertens came into the tournament in good form and the 16th seed is through to the fourth round after a 7-5 6-1 victory over young American Caty McNally.
Seventh seed Madison Keys retired from her third-round clash with France's Alize Cornet early in the second set with a neck injury.
Keys was trailing 7-6 (7-4) 3-2 when she shook her head and told the Frenchwoman and the umpire she could not continue.
Victoria Azarenka recorded her eighth consecutive match win with a 6-4 6-2 success over Polish teenager Iga Swiatek.