Novak Djokovic returns to the scene of his greatest triumphs this week at the Australian Open, adamant he is ready and able to see off the challenge from Jannik Sinner and Carlos Alcaraz in his pursuit of a record 25th Grand Slam crown.

As Andy Murray joins Novak Djokovic as his coach for the Australian Open, BBC Sport takes a look at the defining moments of their great rivalry.

Novak Djokovic is targeting an 11th Australian Open title and record 25th Grand Slam crown but faces an uphill battle against Jannik Sinner and Carlos Alcaraz. - Carlos Alcaraz - Still just 21, the Spaniard already owns four Grand Slam titles -- including the French Open and Wimbledon last year -- since bursting on the scene with victory at the US Open in 2022.

Even at 37 years of age, and having won everything there is to be won in singles tennis with his achievement of Olympic Gold in Paris in 2024, Novak Djokovic continues to have that overarching desire to win that is present in every elite athlete.

Novak Djokovic may be 37, but the 24-time Grand Slam champion can never be counted out as he aims to make more history in Melbourne.

The Big Three of Novak Djokovic, Roger Federer and Rafael Nadal have 19 Grand Slam finals defeats between them.

The Australian had been due to play in an exhibition match alongside Novak Djokovic, but pulled out due to an abdominal injury

Nick Kyrgios says he is doing all he can to be fit for the Australian Open after withdrawing from an exhibition match with an abdominal strain.

Nick Kyrgios is in danger of missing the Australian Open, with the returning star suffering an abdominal injury.