Former champion Jelena Ostapenko blitzed her way past second seed Karolina Pliskova on Thursday to reach the third roound of the French Open in Paris.
The 23-year-old Lavtian fired 27 winners in the 6-4, 6-2 sweep over one of the favourites for the women's singles crown.
"I had to bring the best tennis that I could,” added the world number 43.
The defeat completed a miserable year at the Grand Slam tournaments for Pliskova.
The 28-year-old Czech only made the third round at the Australian Open and second round at the US Open.
Pliskova's compatriot, Petra Kvitova, fared better. The seventh seed was businesslike in her straight sets win over the world number 94 Jasmine Paolini. Kvitova dispatched the Italian 6-3, 6-3 in 84 minutes.