At 21, the Australian is the youngest member of the semifinal line up but arguably made the most impressive progress to this stage as she dropped only 12 games over the course of her two matches in the Rose Group.
No.4 seed Anastasia Pavlyuchenkova was beaten 6-4, 6-1 before Angelique Kerber was also seen off in straight sets 6-3, 6-4. She will face CoCo Vandeweghe in the final four.
The German was the final player to reach the semifinals as she won the Azalea Group to book a date against Anastasija Sevastova. After winning the first set 6-1 against Magdalena Rybarikova in her opening match, she was made to fight hard before claiming the second 7-6(5).
She only needed to win a single set against No.1 seed Kristina Mladenovic to progress but recorded her seventh-straight victory by ousting the Frenchwoman 6-2, 7-6(4) on Friday.
The Latvian opened up her campaign against Sloane Stephens, who had beaten her in the US Open quarterfinal earlier this year. However, that ghost was laid to rest as the 27-year-old came through in straight sets 7-5, 6-3.
She took the opportunity to book her place in the final four of the competition in the Camellia Group’s second match by seeing off the challenge of Barbora Strycova 6-3, 6-4 to progress without dropping a set.
There were few problems for the No.2 seed in winning the Bougainvillea Group. The 25-year-old, who reached the semifinals at both the Australian and US Open in 2017, started her campaign with a 3-6, 6-3, 6-2 victory over Peng Shuai, which proved to be critical.
Elena Vesnina was comfortably dispatched in the American’s second match, as she recorded a 6-3, 6-2 win over her Russian opponent, who was struggling with a back injury.