World number seven Jelena Ostapenko was stunned by Estonia’s Anett Kontaveit in the third round of the Australian Open.
The French Open champion was beaten 6-3 1-6 6-3 by world number 33 Kontaveit in one hour and 53 minutes.
Kontaveit drew a series of errors out of her former junior doubles partner, but Ostapenko recovered to force a deciding final set.
However she was overpowered by Kontaveit, who will play Spain’s world number 39 Carla Suarez Navarro next.
Ostapenko’s exit means that Angelique Kerber and Maria Sharapova – who play each other on Saturday – are the only two Grand Slam champions remaining in the women’s draw.
There were 11 double faults in a scrappy affair on Rod Laver Arena, with Latvia’s Ostapenko losing all five of her service games in the first set.
Ostapenko took a medical timeout before the second set for treatment on her thigh and she found enough rhythm to take the game into a third set.
Despite some solid defence from Ostapenko, Kontaveit got the decisive break before winning eight of the final ten points of the match to reach the fourth round in Melbourne for the first time.