Jankovic downs Muguruza

Jankovic defeated Muguruza 6-3, 6-0 shortly before showers interrupted the first matches of the day on 12 other courts.

Zheng Jie also reached the third round, beating Melanie Oudin of the United States 6-3, 6-1.

With the cool midday temperature, Jankovic took the court wearing pink leggings and a long-sleeve pink shirt. She beat Muguruza with steady play from the baseline while the 19-year-old Spaniard committed 29 unforced errors.

Jankovic, seeded 18th, is a three-time semi-finalist at Roland Garros.

On the men's side, No 16 Philipp Kohlschreiber advanced when Yen-hsun Lu withdrew because of a right ankle injury.