Ana Ivanovic heads Aegon Classic line-up in Birmingham

Ana Ivanovic
Ana Ivanovic lifted her maiden title on grass with a 6-3 6-2 final victory over Barbora Strycova in 2014

Defending champion Ana Ivanovic heads a strong line-up at this year's Aegon Classic Birmingham.

Fellow Grand Slam winners Victoria Azarenka and Svetlana Kuznetsova, as well as current world number two Simona Halep are also among the field.

German trio Andrea Petkovic, Angelique Kerber and Sabine Lisicki, and US star Madison Keys are all currently ranked in the world's top 20.

The seven-day pre-Wimbledon tournament begins at Edgbaston Priory on June 15.