Jason Kubler

Drawn against 24th seed Ivan Ljubičić, Kubler was handily beaten 6–2 6–1 6–1 in a lacklustre display.

In April, Kubler won the first main draw professional match of his career at the Australia F3 Futures event in Ipswich, where he went on to make the final, losing to Brydan Klein.

Jason Murray Kubler (born 19 May 1993) is an Australian professional tennis player.

He has a career-high ATP singles ranking of No. 63 achieved on 24 April 2023 and a doubles ranking of No. 27 achieved on 22 May 2023.

Kubler's career highlight came at the 2023 Australian Open, where he won his first Grand Slam doubles title as a wildcard alongside compatriot Rinky Hijikata.

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.

The condition has plagued Kubler throughout his career, resulting in six knee surgeries.

Kubler also spent four years of his professional career playing exclusively on clay courts to avoid further structural damage to his knees.

Kubler was born in Brisbane, Australia to an Australian father and a Filipina mother.

His father, John, introduced Kubler to tennis at the age of five, but died of cancer when Kubler was eight years of age.

Kubler grew up in the north Brisbane suburb of Mango Hill with an older brother and a younger sister.

Kubler made his professional debut in September 2008 at the Australia F7 Futures event on the ITF Men's Circuit, the third tier for men's professional tennis.

Kubler won through qualifying to make his main draw professional debut but lost in the first round to compatriot Marinko Matosevic.

In 2009, Kubler became just the second player in history (after Rafael Nadal) to go undefeated through the World Youth Cup and Junior Davis Cup.

Following his success at the Junior Davis Cup, Kubler won five titles in a row which saw his junior ranking rise to No. 3 in the world.

Kubler won six junior titles throughout his career and achieved the combined No.1 world ranking in May 2010 with a win–loss record of 67–17 in singles and 40–19 in doubles.

In 2010, following continued success on the junior circuit, Kubler was granted wildcards into the Brisbane International and Sydney International qualifying draws, but failed to win a match at either event.

He was then awarded a wildcard to make his ATP Tour and Grand Slam debut at the 2010 Australian Open.

Kubler's best results for the remainder of 2010 were a string of semi-final appearances at Netherlands F2, Italy F23, Portugal F5 and Spain F37 Futures events.

He finished the season ranked No. 535 in the world.

In May, Kubler qualified for the ATP event in Düsseldorf, his first ATP World Tour event since the 2010 Australian Open.

He won his first tour-level match by defeating Alessandro Giannessi, before losing to Denis Istomin in the second round.

In June, Kubler returned to the Futures circuit and defeated the number one seed Kimmer Coppejans in the final of the Netherlands F3 in Breda.

Kubler missed the start of the 2011 Australian summer of tennis due to a knee injury.

Further injuries during the year limited his play before he won the first professional title of his career at the USA F28 Futures event in Birmingham, defeating Yoshihito Nishioka in the final.

Kubler won his second professional title the next week at the USA F29 Futures event in Niceville, salvaging an otherwise frustrating year with injury.

He finished the 2011 season ranked No. 530 in the world.

Kubler began the 2012 season by entering four Futures tournaments in Florida after again bypassing the Australian summer.

Kubler lost in the final of USA F1 to Jack Sock and USA F3 to Brian Baker before winning the USA F4 event in Palm Coast to cap off a promising start to the year.

Kubler returned to Australia in March, where he lost the final of the Australia F3 event against Sam Groth but defeated John Millman to claim the Australia F4 title in Bundaberg.

Kubler then travelled to Europe, to compete in further Futures tournaments and the first Challenger events of his career, where he made a quarter-final at the Todi Challenger in September.

Following more success on the Futures tour, Kubler's world ranking steadily rose, peaking at a career-high No. 268 on 29 October 2012.

He ended the 2012 season ranked No. 332 in the world.

In 2013, Kubler played in Futures tournaments throughout the United States, Spain, Great Britain, Australia, Italy and Egypt, but only on clay due to ongoing knee concerns.

He won three Futures tournaments for the year, however his ranking dipped to No. 397 to end the season.

Kubler again chose to miss the Australian summer of tennis, opting to play Futures events in Egypt and Spain.

He entered six tournaments during this stretch, making the final of three and winning one.

In March, Kubler qualified for the main draw of Challenger events in Panama and Barranquilla, but failed to win a match at either tournament.

In April, he competed in further Challenger events in Savannah and Tallahassee, making the second round at both tournaments.

He broke into the top 200 for the first time on 25 August 2014 at No. 197.