1 Sabalenka tamed 18-year-old Iva Jovic of the US 6-3, 6-0 in 38°C temperatures, while last year’s runner-up Zverev sent down a barrage of 24 aces to crush another young US player, Learner Tien, in four sets. That match was played under the Rod Laver Arena roof as temperatures peaked at 43°C outside. Aryna Sabalenka of Belarus returns to Iva Jovic of the US in their Australian Open women’s singles quarter-final in Melbourne yesterday. The decision came after the tournament hit its maximum “heat stress” rating of five for the second time in four days. Defeat brought an end to a breakthrough tournament for Jovic, the youngest player in the women’s top 100 and seeded 29.