As Jack Draper retires from his Australian Open fourth-round match, BBC Sport analyses the key questions around his injury issues.

As well as disrupting his off-season, Draper's hip injury meant he was unable to play a warm-up event before the first Grand Slam of the year. In a bid to regain sharpness, he played practice sets against 24-time major champion Novak Djokovic and world number one Jannik Sinner last week on Rod Laver Arena.

After splitting sets with Aleksandar Vukic, the 15th seed found himself facing a set point in the third and obliterated his racket in frustration. It delayed the next point as Draper went to dig out a new racket and dampener while the crowd booed. But he was happy to give it back, jeering the fans on as commentators claimed he "lost the plot".

Marathon man Jack Draper says Carlos Alcaraz will have a battle on his hands when they meet in the Australian Open last 16, with the Briton showing remarkable staying power to set up the clash.

British number one Jack Draper says he is better prepared to face the heat and overcome concerns about his fitness at this year's Australian Open.

British No 1 Jack Draper comes through tough opening Australian Open test in five sets; watch all the action from the ATP and WTA Tours on Sky Sports Tennis and Sky Sports+ which is integrated into Sky TV,

Carlos Alcaraz said that he was looking forward to facing Novak Djokovic in the quarterfinal of the hard court major at Melbourne Park. Alcaraz reached the last eight after Jack Draper retired due to injury.

Jack Draper has had a short preparation this year for the first Grand Slam of the season, but after sterling five-set victories over useful Australians Thanasi Kokkinakis and Aleksandar Vukic, the Surrey ace may just about be ready to take on Carlos Alcaraz.

Meanwhile, Fearnley reached the third round on his Australian Open debut with a comeback victory over Arthur Cazaux. Fearnley dropped the first set after a rain delay but the Scot did not blink and came back to win 3-6 7-5 6-2 6-3. His astonishing rise will continue when he plays the second seed Alexander Zverev for a place in the last-16.

Novak Djokovic said he was braced for “a big battle” after setting up a blockbuster Australian Open quarter-final with Carlos Alcaraz on Sunday. The 37-year-old Serb, who is gunning for a record 25th Grand Slam title and 11th Melbourne crown,

Jack Draper digs deep into his reserves to reach the Australian Open third round, where he is joined by fellow Briton Jacob Fearnley.