British number one Johanna Konta says she always believes she can stay "until the very end" at a Grand Slam.
Konta, seeded 26th, is the first British woman to reach the French Open last 16 since 1983.
She will play Croatian 23rd seed Donna Vekic for a place in the quarter-finals on Sunday.
"I have been in two Grand Slam semi-finals, so I know the feeling of wanting to go a step further," the 28-year-old said.
Konta had never won a main-draw match at Roland Garros until this year.
But, after a superb clay-court season where she reached WTA finals in Morocco and Rome, she has continued to build on that form in Paris.