Back came Djokovic, breaking serve for a 3-1 lead in the second set and then saving three break points for 4-1. Sinner had three break points at 5-4 and nailed the set on the second one when a Djokovic lob drifted long. But the gutsy Djokovic was not done, breaking the Sinner serve early in the fourth set as the time ticked past midnight. They went to a deciding fifth set, and the tension went up another notch, as Sinner repeatedly squandered chances to break serve. Djokovic was ruthless, seizing the break for 4-3, then holding, to put an 11th Melbourne final within reach.