Osaka's claycourt season starts with a loss in Madrid

The 55th-ranked Osaka was unseeded in Madrid for her first match in almost a month since reaching the fourth round of the Miami Open. Italy's Bronzetti will play fifth-seeded American Madison Keys in the second round.

Alexandra Eala will get a rematch with Iga Swiatek in the second round in Madrid after stunning the Polish player as a wild card in Miami last month. The 19-year-old Eala won her first-round match 6-3 6-2 against Viktoriya Tomova. 

There were also victories for Caroline Dolehide (US), Jessica Bouzas Maneiro (Spain) and Marie Bouzkova (Czech).

Kimberley Birrell was due to play American Peyton Stearns later on Tuesday. New Aussie No.1 Daria Kasatkina, who has a bye to the second round as No.14 seed, and Anja Tomljanovic are also in the 128-player draw for the WTA 1000 event.