Wozniacki doesn't play doubles a lot; but has decided to in this instance likely due to her impending retirement and the duo being good friends away from the court.
Williams was a bridesmaid at her wedding to David Lee; while Wozniacki has played at this tournament every year since 2015 to get herself ready.
It is the American's first appearance since 2017; so having both players on the court together for maybe even the last time in doubles is a must watch; going into her final event at the Australian Open
https://twitter.com/ASB_Classic/status/1208871252779253761