Johanna Konta boosted British hopes at the Australian Open with a titanic three-set win over home player Ajla Tomljanovic in Melbourne.
The British number one, 28, won a final-set tie-break to edge a finely-balanced match.
She joins Katie Boutler and Dan Evans in round two after a 7-6 (7-4) 2-6 7-6 (10-7) win.
Konta will play either two-time Grand Slam champion Garbine Muguruza or China's Saisai Zheng next.
Konta, who reached a career-high ranking of four in 2017, is left as the nation's leading contender following exits for Andy Murray and Kyle Edmund on Monday.