As Serena Williams prepares for her tilt at a sixth Australian Open crown, the world number one is not pleased with her preparation leading into the first grand slam of the year.

Top-seeded American Williams will begin her Australian Open campaign against Belgian Alison Van Uytvanck at Melbourne Park.

Williams is favourite to win her first grand slam title Down Under since 2010, but the 33-year-old's form heading into the tournament has done little to suggest she can add to her array of trophies.

The 18-time grand slam winner opted to open the year at the Hopman Cup in Perth, where she struggled, losing two of the four singles matches.

"I'm not very happy with it [form], but I'm never really happy about my practice or preparation," Williams told a media conference in Melbourne on Saturday.

"So maybe that's a good sign. Yeah, I'm just still every day going out there, working really hard.

"I definitely feel better now than I did a couple weeks ago. But I still want to improve some things.

"I feel like I should be doing some things better. But every day I can see something coming through, so ... there's a little light at the end of the tunnel."