Second seed Karolina Pliskova has been beaten in the second round by Jelena Ostapenko, who produced a display reminiscent of that which won her the 2017 title in Paris.
Czech Pliskova, 28, was overwhelmed by the ferocious returns of her Latvian opponent, who had been knocked out in the first round the past two years.
Ostapenko made a crucial break in the seventh game of the opening set.
Pliskova was then broken twice more as the 23-year-old sealed a 6-4 6-2 win.
Ostapenko's form dipped dramatically after her victory over Simona Halep at Roland Garros in 2017.