Aryna Sabalenka continued her quest for a first French Open title by fighting past best friend Paula Badosa to reach the fourth round.

Belarusian Sabalenka, who reached the semi-finals last year, won 7-5 6-1 against the Spanish former world number two.

A competitive and entertaining first set, where both players demonstrated their power from the baseline, saw seven breaks of serve before second seed Sabalenka closed it out.

The second set was one-sided as 139th-ranked Badosa's level dropped.

Badosa, who has fallen down the rankings after a stress fracture in her back, saved three match points before putting a backhand long on the fourth.

"I just tried to play my best and fight for every point. I know the conditions were tough and the serve wasn't an advantage," said 26-year-old Sabalenka, who won 10 of the final 11 games.

Two-time major champion Sabalenka will play either American 14th seed Madison Keys or her compatriot Emma Navarro, seeded 22nd, next.

Rain once again delayed play on the outside courts in Paris on Saturday, but Sabalenka and fourth seed Elena Rybakina advanced under the roof on Court Philippe Chatrier.