True, but she also wasn't that good, which was pretty evident whenever she played on the WTA tour.Gotcha.
I'll add in, Kostyuk has been somewhat disadvantaged by where she comes from. She was the youngest player to reach the 3rd round at the Australian Open since Hingis, but she basically never got wildcards, and she never had a home tournament to play in of any real stature.
An American, Brit, Aussie, or French player doing what she did would be garnering all kinds of interest, and Kostyuk's disappeared as quickly as the Australian Open ended. A 15-year-old American ranked in the 130s would have gotten a wildcard into Indian Wells and/or Miami for sure, and Kostyuk was playing 60ks in China instead.
She had an extremely fortunate run to the AO R3 before getting routined by Svitolina in under an hour, then continued having some good results on the ITF tour. She had some flashy results at WTA events like beating Cornet at Stuttgart qualifying and taking a slumping Garcia to 3 sets at the same tournament, but she also had losses like... losing to Ruse in QR1 at Prague, losing to Arruabarrena at Madrid in R1 (where she got a WC), not qualifying for RG, Wimbledon or the USO, losing in R1 of Mallorca (where she got a WC), as well as in R1 of Bol, Tashkent, and some 100K events.
I remember wondering why she was getting any WCs at all when she was only 15 and hadn't done much at the WTA level apart from a lucky run where she faced a slumping Peng and Rogowska. Someone like Gauff benefited from WCs due to her citizenship and was the same age as Kostyuk when she had her WTA breakthrough, but Gauff... won matches, lol. Kostyuk didn't.