Jelena Ostapenko (25) stunned Coco Gauff (18) 7-5 6-3 to reach the quarter-finals of the Australian Open on Sunday after putting on a power-hitting clinic.
Latvian Ostapenko has struggled to reach the heights of her French Open-winning days but the 17th seed simply overpowered the American at Margaret Court Arena.
Ostapenko was ruthless in the finish, unleashing a thumping forehand down the line to bring up match point, then clipping the line with a crosscourt forehand winner to give Gauff no chance.
"I always knew and believed in my game," Ostapenko told reporters.
"If I play well, I can beat almost anyone. I was trying to work more on my consistency, especially in the pre-season. Yeah, just to step on the court and play my game.
"I think I'm doing it quite well this week."
The 17th seed will meet Elena Rybakina, who shocked top seed Iga Swiatek, for a place in the semi-final.
