Caroline Wozniacki completed her first marathon last November - and was almost forced to run another in last night's ASB Classic semifinal.

Bowing out of the doubles at the ASB Classic was something of a mixed blessing for Marina Erakovic.

Tournament top seed and world No8 Caroline Wozniacki enjoyed the support of some familiar fans at the ASB Classic on Wednesday night.

Venus Williams will take the court today in Auckland - but her countrywomen have already set the standard at the tournament.

The upsets at the ASB Classic continued on centre court this afternoon with second seed Sara Errani crashing out in a straight sets defeat.

Seven-time grand slam winner Venus Williams, ranked World No18, enjoyed a powhiri and a glimpse of Maori culture through hongi, waiata and speeches.

Venus Williams, back for another crack at New Zealand's women's tennis prize, says she intends to do "a whole lot better" at next week's ASB Classic tournament.

With the full field virtually sealed ahead of January's tournament, the ASB Classic continues to hold its own against more affluent opposition.

Serbian Ana Ivanovic is a strong possibility to be named as the top seed for January's ASB Tennis Classic in Auckland this afternoon.

One of the biggest names in world sport, Venus Williams, will return for the 2015 ASB Classic as part of the NZ Festival of Tennis.

It might be just the first tournament of the year, when players are a little rusty after the off-season, but there are positive signs.

It took some time to get going but Ana Ivanovic and Venus Williams eventually delivered a final worthy of two former world No 1s.

It is the final most hoped would eventuate, with two former world No 1s and grand slam champions squaring off against each other.

A lot of tennis players have superstitions and Ana Ivanovic has one of which she's not particularly proud.