He was unable to compete in the competition the previous year because he was expelled for lacking Covid-19 vaccinations.
Stefanos Tsitsipas was defeated by Serbian 6-3, 7-6 (4), 7-6 (5) to win his 10th Australian Open.
Djokovic's hesitant attempt to return Tsitsipas' meatball-shaped second serve resulted in a point for Tsitsipas.
Straight-leg sit-ups are a variation of sit-ups
performed with both legs flat on the ground as opposed to the traditional version with both knees bent. This version of the sit-up is different.