Kvitova keeps rolling

Second seed Petra Kvitova has continued her march towards a second Grand Slam title with a straight-sets victory over Ana Ivanovic in the fourth round of the Australian Open on Monday.

Kvitova put on a clinical display as she overpowered the Serbian 21st seed in a 6-2 7-6 (7-2) win in 85 minutes at Rod Laver Arena.

The Czech star has the chance to reach No.1 in the world with victory at Melbourne Park, which would be her second major title in less than a year following her success at Wimbledon.

Kvitova's powerful ground strokes were too much for Ivanovic as she reeled off 30 winners to just 14 from her opponent.

Kvitova landed just 48 percent of first serves in the first set but still didn't offer up a single break point opportunity, while creating four for herself.

She converted two of those - in the third and seventh games - to comfortable take the first set in just 31 minutes.

Ivanovic had the chance to hit back early in the second, but Kvitova saved two break points before breaking the Serbian's serve in the fifth game to take a stranglehold on the match.

Nerves set in for Kvitova when serving for the match in the 10th game as she was broken to love with a tiebreaker needed to decide the set.

But in the tiebreaker, Ivanovic served up two double faults and committed two crucial unforced errors to virtually hand the match to her opponent.

Kvitova will fancy her chances of reaching the last four with her quarter-final opponent either world No.38 Jie Zheng or No.48 Sara Errani.