Tsitsipas was initially made to work against the world No.52 Berrettini, who saved the only break point of the 50-minute first set, which the Italian went on to win in the tiebreak.
But helped by the passionate Greek supporters who created an electric atmosphere on Melbourne Park’s No.3 court, the free-flowing game that saw Tsitsipas rise to a career-high world No.15 ranking in 2018 soon started working more effectively.
The Greek’s next break point opportunity – in the fifth game of the second set – was easily converted, and as his winner count grew throughout the match, Tsitsipas smoothly controlled the outcome.
Claiming the second set in 36 minutes, Tsitsipas also kept his legion of supporters entertained as he twice broke the Berrettini serve to claim the third set in 38 minutes.
His own serve helped stave off any trouble. It was only in the fifth game of the fourth set that a forehand winner from Berrettini earned the Italian his first break point opportunities.
Tsitsipas saved the first with an unreturnable serve and the second with a successful challenge after the umpire had overruled on a Berrettini error. Adding to his confidence, the Greek closed out that game with one of 15 aces.