Defending champions Novak Djokovic and Serena Williams cruised into the Australian Open third round, but sixth seed Petra Kvitova was knocked out.
Women's number one, Williams, thrashed Taiwan's Hsieh Su-Wei 6-1 6-2 while men's top seed, Djokovic, beat France's Quentin Halys 6-1 6-2 7-6 (7-3).
Roger Federer and Maria Sharapova also made it through safely.
But two-time Wimbledon champion Kvitova lost 6-4 6-4 to 21-year-old Australian Daria Gavrilova.
British number ones, Andy Murray and Johanna Konta, resume their campaigns in the second round today.
Giant-killing Gavrilova, the world number 39, said she was "just really happy" after her win over Kvitova.
"It was unreal. I was so nervous in the end, you probably could tell," said the Russian-born Australian, who only switched nationality in December.
She now plays France's Kristina Mladenovic next Friday for a place in the fourth round.
Kvitova made 35 unforced errors and was broken five times in the 89-minute contest on Margaret Court Arena.
The Czech joined second seed, Simona Halep, and eighth seed, Venus Williams in suffering a shock early exit. —BBC
