Serena Williams was relentless in her first appearance at Melbourne Park since winning the title in 2017, losing only five points in the opening set on her way to a 6-0, 6-2 win over Tatjana Maria in just 49 minutes.
The 23-time major winner didn't defend her title last year while she was taking time off following the birth of her daughter.
Maria wasn't helped by her woeful serving — she made only three of 14 first serves in the opening set.
Williams gave Maria, who also has a daughter, a warm embrace at the end of the match.