Simona Halep in trouble at French Open against Osaka

PARIS (AP) Garbine Muguruza became the first player to reach the fourth round at the French Open, and Simona Halep followed closely behind.

The fourth-seeded Muguzura beat Yanina Wickmayer of Belgium 6-3, 6-0 Friday, while the sixth-seeded Halep had a tougher time against Naomi Osaka in what was the Japanese teen's first match against a top-10 player. Halep won 4-6, 6-2, 6-3.

Showing no nerves in only her second major tournament, Osaka won the first set but then struggled against the 2014 French Open runner-up from Romania.

Halep broke Osaka to love in her first service game of the second set and converted the first of two break points at 5-2 to level at one-set each. In the third, Halep again broke Osaka to love for a 5-3 lead and then served out the victory.

Osaka hit 26 winners, but 38 unforced errors undermined her effort to improve on her third-round showing at her first Grand Slam tournament, this year's Australian Open.

Muguruza, who was the runner-up at Wimbledon last year and reached the quarterfinals at the French Open in 2014 and 2015, lost one service game to Wickmayer in the first set but otherwise had no real difficulties.

Wickmayer had no break points in the second set and saved none of the six she faced, while Muguruza had an impressive ratio of 19 winners to only 11 unforced errors.