Denmark's Caroline Wozniacki reacts after beating Croatia's Jana Fett in their women's singles second round match on day three of the Australian Open tennis tournament in Melbourne. Pic/AFP

Many of the top seeds at the Australian Open tennis tournament struggled through their second round matches here on Wednesday, as young guns put on a show for the 70,000 fans in attendance at Melbourne Park. What was supposed to be a routine match up for women's singles second seed Caroline Wozniacki, soon turned into the most exciting tussle of the day, reports Xinhua news agency.