Britain’s Johanna Konta eased through to the Australian Open third round but Heather Watson and Kyle Edmund both lost in the second round in Melbourne.
Ninth seed Konta, 25, produced a confident display to beat 19-year-old Naomi Osaka of Japan 6-3 6-2.
Watson had five match points but was knocked out 2-6 7-6 (7-3) 10-8 by American qualifier Jennifer Brady.
Edmund, hoping to join Andy Murray and Dan Evans in the next round, lost 6-2 6-4 6-2 to Spain’s Pablo Carreno Busta.
Konta, who will face Denmark’s 17th seed Caroline Wozniacki on Saturday, faced one of the most promising players in the women’s game.
The big-serving Osaka, ranked 48th, had a chance to break Konta in the eighth game but missed a forehand and then looked on helplessly as the Briton fired down two aces to hold serve.
Konta took advantage of her opponent’s loss of focus to break to love and then served out the opening set in clinical fashion.
The Briton dominated the second set to secure her 10th win of 2017.
“I love playing on these amazing courts and I’m looking forward to staying here as long as possible,” she said.