Azarenka advances in Madrid
World number one Victoria Azarenka survived a tricky first-round clash with Svetlana Kuznetsova on a good day for the seeds at the Madrid Open.
Azarenka overcame her losing record against the veteran Russian as she battled her way to a 7-6 (7/5) 6-4 success in an hour and 45 minutes.
The Belorussian was joined in the second round by star names Maria Sharapova and Caroline Wozniacki.
Second seed Sharapova thrashed Irina-Camelia Begu 6-0 6-3 while Wozniacki, a finalist last year, needed three sets to overcome Ksenia Pervak 7-6 (9/7) 3-6 6-4.
Fourth seed Agnieszka Radwanska enjoyed a comfortable 6-3 6-1 start against wildcard Lara Arruabarrena-Veci while fellow seeds Angelique Kerber (12), Ana Ivanovic (13) and Maria Kirilenko (16) also progressed.
Former French Open winner Francesca Schiavone (11) was one of just two seeds to fall, the Italian losing 6-4 6-7 (8/10) 6-3 to qualifier Varvara Lepchenko in almost three hours.
There was better news for her countrywoman Roberta Vinci though as she beat 14th seed Dominika Cibulkova 6-3 6-2.
Also progressing were qualifier Lourdes Dominguez Lino, Shahar Peer, Anabel Medina Garrigues, Nadia Petrova, Yanina Wickmayer and Anastasia Pavyluchenkova.
In the men's draw, Nikolay Davydenko and Kevin Anderson won through to the second round.
Davydenko beat Ivo Karlovic 7-6 (7/4) 6-3 while South African Anderson cruised through 6-3 6-2 against Alex Bogolomov Jnr.