Jason Murray Kubler is an Australian professional tennis player. He has a career-high ATP singles ranking of No. 86 achieved on 9 January 2023 and a career-high doubles ranking of No. 152 achieved on 26 September 2022. Despite a promising junior career, which included the junior world No. 1 ranking and comparisons to Rafael Nadal, Kubler has spent the majority of his professional career on the lower circuits due to a hereditary knee condition that results in weakened meniscus around the joints.

https://en.wikipedia.org/wiki/Jason_Kubler