The second seed at the Auckland women's Classic is wary of the challenge former world number one tennis player Venus Williams poses into today's final.
Ana Ivanovic has reached the final with a straight sets semi final win against third seed Kirsten Flipkens of Belgium
The Serb says Williams has displayed some good play over the week while her powerful serve is always a threat.
Ivanovic has played Williams nine times before and has only won once.
