Wozniacki returns as Aust Open champion

By Ben McKay
Updated January 13 2019 - 1:31pm, first published 1:28pm
A refreshed Caroline Wozniacki is very relaxed about starting her Australian Open title defence.
A refreshed Caroline Wozniacki is very relaxed about starting her Australian Open title defence.

On the eve of her Australian Open title defence, Caroline Wozniacki admits the biggest unknown in 2019 might be the sport's most-enduring champion Serena Williams.

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