Ana Ivanovic "thrilled" with victory over Serena Williams

Ana Ivanovic has said that she is "thrilled" to have defeated Serena Williams in the fourth round of the Australian Open on Sunday.

The 26-year-old Serbian got the better of her American opponent 4-6 6-3 6-3 at the Rod Laver Arena to book her place in the quarter-finals.

"It's amazing," BBC Sport quotes her as saying. "Honestly, I went on the court and I just wanted to play the best I could. I'm so thrilled."

Ivanovic will take on either Eugenie Bouchard or Casey Dellacqua for a place in the last four.