MADRID (AP) — Defending champion Aryna Sabalenka faced tough resistance in her opening match at the Madrid Open before beating Magda Linette 6-3, 4-6, 6-3 on Friday.

The second-ranked Sabalenka struggled with her serve at times, but the two-time Australian Open winner struck her 10th ace on match point at the Caja Magica in Spain’s capital.

Sabalenka got some help from the net to get a key break and go up 5-3 in the third set when Linette was unable to reach a shot by the Belarusian that clipped the top of the tape.

Top-ranked Iga Swiatek won her opening match on Thursday. Sabalenka beat Swiatek in last year’s final in Madrid and also won here in 2021.

Fourth-seeded Elena Rybakina beat Lucia Bronzetti 6-4, 6-3, while American Ashlyn Krueger downed Ekaterina Alexandrova 6-3, 6-3.

Mirra Andreeva, Anastasia Pavlyuchenkova, Carolina Garcia, and Jasmine Paolini also advanced.