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.

"In agreement with our tennis players, we are registering the strongest team, which will be led by Novak Djokovic ," said Troicki. "The first Grand Slam of the season in Australia is also ahead for everyone and we are waiting to see the results they will achieve in that tournament.

Novak Djokovic and new coach Andy Murray have been seen practising together for the first time ahead of the start of the Australian Open on Sunday.

Novak Djokovic of Serbia (L) and coach Andy Murray look on during a training session ahead of the ... [+] Australian Open tennis tournament in Melbourne on January 7, 2025. (Photo