MELBOURNE: Jannik Sinner powered into the Australian Open quarter-finals on Monday, while defending women’s champion Madison Keys crashed out, as Melbourne braced for a forecast 45C heatwave. Read More: Keys dumped out in last 16 as Melbourne braces for heatwave Sinner, recovering from cramps in his third-round match, defeated fellow Italian and close friend Luciano Darderi 6-1, […]