Novak Djokovic: He may be 36 but the 24-time Grand Slam winner is still the man to beat after another hugely successful 2023, which included overcoming Stefanos Tsitsipas in the Melbourne final. The Serbian finished the year as world number one after winning three of the four majors, with only Carlos Alcaraz at Wimbledon denying him a clean sweep. In total, Djokovic claimed seven titles to take his career haul to 98, including a record-equalling seventh ATP Tour Finals crown. But there is concern around a right wrist injury which saw him lose to Alex de Minaur at the United Cup in Perth last week.