French wild card Lois Boisson produced a stunning upset at the Roland Garros on Monday, ousting American world No. 3 Jessica Pegula in a thrilling 3-6, 6-4, 6-4 victory.

Loïs Boisson had never even played at the French Open before, let alone in the biggest arena at Roland-Garros, and now the unseeded 21-year-old Frenchwoman is through to the quarterfinals.

After tearing through the third rung of professional women’s tennis, the French Tennis Federation (FFT) awarded Boisson a wild card for the French Open. A week before, at a minor tournament in Paris, Boisson tore her anterior cruciate ligament in her left knee and missed nine months of tennis. She didn’t even watch the tournament on television.