Former champion Svetlana Kuznetsova rolled back the years to crush third seed Agnieszka Radwanska at the French Open.
Radwanska was dumped out as she succumbed 6-1 6-2 to the 2009 winner.
Kuznetsova has always been a strong player on clay but Radwanska, ranked 25 places higher than her opponent as three in the world, had started the favourite following a good start to the season.
Yet when play began on Court Philippe Chatrier on Friday, Kuznetsova was soon dominating the rallies and pushing the Pole way back beyond her own baseline.
She stormed through the first set and then raced 3-0 up in the second.
Radwanska, an impressive winner in Miami earlier this season, briefly threatened a comeback, breaking Kuznetsova's serve to reduce the deficit to 3-2.
However, she followed that by losing her own delivery immediately and Kuznetsova was soon celebrating victory after just 72 minutes on court.
The Russian, who always seems to find her form at Roland Garros, said: "I have not played so well in a long time so I'm really happy about it.
"I've practised the right things and I'm very confident with my game. I'm trying to play more forehands, trying to dictate and playing with more speed. This is the game I was playing when I won the US Open and I won the French Open."
In contrast, Radwanska has had a brilliant season and could have gone to number one in the world by lifting the title here, but she has now lost six times in a row to Kuznetsova.
The Pole gave credit to her opponent, saying: "She was just playing too good today. She's a very great player on clay. She was playing very aggressive on both sides. She just had an answer for everything that I was trying to do."
Kuznetsova will now meet Italy's Sara Errani for a place in the quarter-finals.