Paris - Former world No 1 Caroline Wozniacki collapsed to a 0-6, 6-3, 6-3 loss to Russian world No 68 Veronika Kudermetova in the French Open first round on Monday.

The Danish 13th seed had retired injured from her two previous matches in the lead-up to Roland Garros, but looked to have found form in a one-sided opening set.

Last year's Australian Open champion lost her way in the second set, though, making 10 unforced errors, before the 22-year-old Kudermetova cruised to victory in the decider on a sparsely-populated Court Philippe Chatrier.

"I was a little bit nervous at the start of the match, but I took it game by game and tried to be more aggressive," said the Russian.

Kudermetova will face either Kazakhstan's Zarina Diyas or French wildcard Audrey Albie in the second round.

Results from the second day of the French Open on Monday (x denotes seeding):

Men

First round

Alex De Minaur (AUS x21) bt Bradley Klahn (USA) 6-1, 6-4, 6-4

Pablo Carreno Busta (ESP) bt Joao Sousa (POR) 6-3, 6-1, 6-2

Juan Ignacio Londero (ARG) bt Nikoloz Basilashvili (GEO x15) 6-4, 6-1, 6-3

Corentin Moutet (FRA) bt Alexey Vatutin (RUS) 6-4, 7-6 (8/6), 6-4

Women

First round

Ashleigh Barty (AUS x8) bt Jessica Pegula (USA) 6-3, 6-3

Jennifer Brady (USA) bt Ivana Jorovic (SRB) 7-6 (7/5), 4-6, 7-5

Polona Hercog (SLO) bt Aliaksandra Sasnovich (BLR x32) 4-6, 6-2, 8-6

Johanna Konta (GBR x26) bt Antonia Lottner (GER) 6-4, 6-4

Lauren Davis (USA) bt Kristyna Pliskova (CZE) 6-2, 6-4

Viktoria Kuzmova (SVK) bt Alize Cornet (FRA) 6-4, 6-3

Kiki Bertens (NED x4) bt Pauline Parmentier (FRA) 6-3, 6-4

Diane Parry (FRA) bt Vera Lapko (BLR) 6-2, 6-4

Veronika Kudermetova (RUS) bt Caroline Wozniacki (DEN x13) 0-6, 6-3, 6-3

Kaia Kanepi (EST) bt Julia Goerges (GER x18) 7-5, 6-1