Kubler was hoping to add a first top-20 win at a Grand Slam tournament to his growing list of achievements tonight, but big-hitting Karen Khachanov had other plans. The 18th-seeded Khachanov recorded a 6-4 5-7 6-4 6-2 victory in their second-round clash at Melbourne Park, striking 15 aces and 57 winners in the two-hour and 53-minute encounter.

https://www.tennis.com.au/news/2023/01/18/kublers-career-best-australian-open-run-ends