MELBOURNE, Jan. 17 -- Many of the top seeds at the Australian Open struggled through their second round matches on Wednesday, as the tournament's 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 second seed Caroline Wozniacki, soon turned into the most exciting tussle of the day.

Down one set to 19-year-old Croatian Jana Fett, Wozniacki looked like she would be making an early exit in the tournament.

With clear signs of frustration, including a moment when the Danish star threw her racket on the ground in anger, Wozniacki managed to compose herself and survive multiple match points in the third set to break serve three times and eventually get the win 6-3, 2-6, 5-7.

It was a similar story for Jo-Wilfried Tsonga, who was pushed to the limit in a 5-set thriller by 18-year-old Canadian player, Denis Shapovalov.

In the end, the experienced Frenchman hung on to win the battle 6-3, 3-6, 6-1, 6-7 (4-7), 7-5.

Third seed Grigor Dimitrov also had a grueling 5-set encounter with 22 years old American Mackenzie McDonald.

But the Bulgarian managed to clinch the victory 4-6, 6-2, 6-4, 0-6, 8-6, after looking down and out in the fourth set.

Other top contenders like Rafael Nadal, Marin Cilic and Pablo Busta Carreno managed to cruise through their second round clashes, while crowd favorite Nick Kyrgios found things a little more difficult.

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