New Delhi: Indian tennis star Sania Mirza has jumped 13 places to 53 in the latest WTA rankings. The improvement in her rank coming as a result of her semi-final appearance at last week's Moorilla International in Hobart. The 20-year-old had beaten world number 29 Maria Kirilenko en route to the semis. She is down one place to 25 in the doubles ranking though. Sania begins her campaign at the Australian Open on Tuesday with a first round match against Ukrainian Olga Savchuk who is ranked 49 places below her.