
Coco Gauff may have gone from the hunter to the hunted but didn't fall prey to a courageous Marta Kostyuk to book a spot in the Australian Open semi-finals for a first time.
The fourth seed and reigning US Open champion extended her grand slam winning streak to a dozen matches with a rollercoaster 7-6 (8-6) 6-7 (3-7) 6-2 victory in Tuesday's first women's quarter-final at Melbourne Park.