Feng Tianwei, usually poker-faced when she plays, breaks into a child-like smile after beating world No. 9 Miu Hirano.
It feels like the 33-year-old has finally unlocked a puzzle she has been struggling with for some time. After all, it is 27 months since she last beat a top-10 player in an ITTF tournament. She was world No. 3 and defeated fourth-ranked Kasumi Ishikawa in the Korea Open final. That title in April 2017 was also Feng's last.