Reigning champion Angelique Kerber said she was finally finding her rhythm at the Australian Open after racing into the fourth round with a 6-0 6-4 victory over Kristyna Pliskova in less than an hour on Friday.

The world number one had taken three sets to win the first two matches of her title defence at Melbourne Park but, two days after her 29th birthday, set an ominous pace by rattling through the first stanza in 20 minutes.

The German had served poorly in the first set and a minor wobble followed in the second but she recovered her composure to progress comfortably to a meeting with American Coco Vandeweghe.

“It’s great to have another good match under my belt and to be in the fourth round again here,” the top seed told reporters.

“It’s great. I’m looking forward to the next one. Yeah, I think that I’m finding my rhythm in the tournament now.”