Serena: My game is clicking

Everything is clicking into gear for defending champion Serena Williams, who feels like her game is peaking at just the right time at the Australian Open.

Williams won through to the fourth round of the season's first grand slam after dispatching Russian teenager Daria Kasatkina 6-1 6-1 on Friday.

The world number one spent just 44 minutes on court in the landslide victory on Rod Laver Arena.

And Williams, who is yet to drop a set at Melbourne Park this year, is happy with her progress following limited preparation heading into the tournament due to a knee injury.

"I definitely think I played better today," Williams said.

"Everything I've been trying to work on was kind of clicking today. I thought I played pretty well in the other matches.

"My first match I thought I gave a great effort. My second match I thought, under the circumstances, I thought I played well.

"Hopefully with each match I can just do better."

The 21-time grand slam champion will face another Russian in the next round, with Margarita Gasparyan standing in the way of Williams and a sixth successive major quarter-final.

Of Gasparyan, Williams added: "She has a great forehand up the line. She has a good serve. She mixes up the ball well. I thought she played really well at Wimbledon. She was fearless.

"She's obviously made leaps and bounds, gained a lot of confidence. She's here to play well and win. So am I, so we'll see what happens."