Jason Kubler was born on May 19, 1993, in Brisbane, Australia, to Lyn Kubler. He began playing tennis at the age of 5 with his brother Jonathan. Kubler’s tennis idols growing up were Lleyton Hewitt and Patrick Rafter. He suffers from a hereditary knee condition, which has greatly hampered his career.
Kubler created headlines by being given a wild card for the 2010 Australian Open as a 16-year-old. However, this proved to be his last Grand Slam main draw appearance for eight years, with Kubler competing on the ITF Futures Circuit for several years after this.
Between May 2010 and October 2017, Kubler reached 21 finals on the ITF Circuit. The first 19 of these were on clay, due to Kubler only competing on the dirt from 2010-2014 to protect his troublesome knee. He won 10 of the 21 Futures finals that he played until October 2017.
From October 2017 until June 2023, Kubler progressed to 11 Challenger Tour finals. 10 of these were on hard courts, with the other being on grass in Ilkley. He claimed the title in seven of those finals, beating players like Dan Evans and Sebastian Ofner along the way.
Until the start of the 2022 season, Kubler’s only Grand Slam main draw victory was at the 2018 US Open against the 19th seed Roberto Bautista Agut. His second win at Grand Slam level was at the 2022 French Open against Denis Kudla. That was followed by an excellent run at the 2022 Wimbledon Championships.
After coming through qualifying, Kubler comfortably overcame Dan Evans and Dennis Novak in the opening two rounds. The Australian then defeated Jack Sock in five sets to reach the Round of 16. His run was ended at that stage by Taylor Fritz.
In 2023, Kubler made the second round of three consecutive Grand Slams: the Australian Open, French Open, and Wimbledon. He also progressed to the third round of a Masters 1000 tournament for the first time at the Indian Wells Open, beating Grigor Dimitrov along the way.
