On a day when Novak Djokovic faced Botic van de Zandschulp in the men’s third-round match, the Australian Open saw several matches postponed as the heat scale reached five during the contest between world number one Jannik Sinner and world number 85 Eliot Spizzirri. With over 100,000 fans expected to attend, Saturday saw matches suspended temporarily on outside courts, and organisers issued warnings for players and spectators to take care in the sweltering heat. Sinner battled back to secure a 4-6, 6-3, 6-4, 6-4 win over Spizzirri, despite trailing 1-3 in the third set. The match began with a heat scale of 3.4, but Sinner benefited from a heat break when the scale reached five while he was still trailing in the third set. He returned to the court and advanced to the fourth round. “It was hot today. I started to cramp a little in the third set, which gradually went away. I know my body better now with a bit of experience and try to handle situations better. I got lucky today with …