Johanna Konta became the first British woman since 1992 to reach the French Open third round as she overcame sickness to battle past Lauren Davis.
Konta, seeded 26th, needed four match points to clinch a hard-fought 6-3 1-6 6-3 win over the American in Paris.
“I’ve been a bit sick since Sunday. I’m doing everything I can to recover and dealing with it,” Konta said.
The 28-year-old British number one will play Slovakia’s Viktoria Kuzmova, ranked 46th, on Friday.
Konta would have expected to face fourth seed Kiki Bertens, who Konta beat in the Rome Masters semi-finals recently, but the Dutch player retired from her match against Kuzmova because of illness.
Konta has also been struggling with a heavy cold, blowing her nose between points and sounding hoarse during the post-match media interviews.
“I wouldn’t say I’m feeling brilliant, but I’m also managing well and cracking on,” she said.
“I’m letting my body heal itself as best as it can with the demands that are on it right now.”
Konta has surged back up the world rankings after a productive clay-court season which has seen her reach the Morocco Open and Italian Open finals, beating Sloane Stephens, Venus Williams and Bertens in Rome.
She had never won a main-draw match in Paris until her first-round win over German qualifier Antonia Lottner on Tuesday.
Now she has a great opportunity to reach the Roland Garros second week after eventually seeing off Davis, who is ranked 111th in the world.
After edging a tight opening set by breaking in the penultimate game, then losing her way in the second, Konta showed impressive mental resilience to eventually take the decider.
She managed to instantly block out the second set, hitting 10 winners and making only two unforced errors to surge into a 5-0 lead.
Then she stuttered again with one game separating her from victory.
Davis saved the first match point on her own serve with a crunching cross-court forehand, then nicked a break back after Konta let slip a 40-15 lead at 5-2.
A hold to love for Davis reinforced momentum had swung back in her favour, with Konta’s plight looking precarious when she trailed 0-40 as Davis threatened to put the set back on serve.
Konta, however, managed to reset again, fighting back to avert danger and clinching victory at the fourth attempt with a thumping drive volley.
“I knew up until the very end, until I was shaking hands with her, it was not going to be over,” added Konta, who has emulated Briton Jo Durie’s achievement of reaching the last 32.
“I’m definitely playing good tennis right now. I’m competing well.
“When I’m presented with tough situations out there, I keep a cool head. I’m managing to problem-solve well, which makes me difficult to play.”
