Victoria Azarenka, runner up at the recent US Open, crashed out in the second round of Roland Garros after losing in straight sets on Wednesday to Slovakia's Anna Karolina Schmiedlova.
The Belarusian 10th seed hit 38 unforced errors in a 6-2, 6-2 defeat against a player who hadn't won a Grand Slam match in five years before her first-round victory over Venus Williams.
Schmiedlova, the world number 161, awaits the winner between 23rd seed Yulia Putintseva and Argentine qualifier Nadia Podoroska for a place in the last 16.
French Open results at Roland Garros on Wednesday, the fourth day of the delayed 2020 championship (x denotes seeded player):
Taylor Fritz (USA x27) bt Radu Albot (MDA) 6-3, 6-2, 6-4
Stan Wawrinka (SUI x16) bt Dominik Koepfer (GER) 6-3, 6-2, 3-6, 6-1
Elina Svitolina (UKR x3) bt Renata Zarazua (MEX) 6-3, 0-6, 6-2
Ekaterina Alexandrova (RUS x27) bt Astra Sharma (AUS) 6-3, 6-3
Anna Karolina Schmiedlova (SVK) bt Victoria Azarenka (BLR x10) 6-2, 6-2
Nadia Podoroska (ARG) bt Yulia Putintseva (KAZ x23) 6-3, 1-6, 6-2
Tsvetana Pironkova (BUL) bt Serena Williams (USA x6) walkover