Jannik Sinner powers into semi-final after ominous display against Struff

Defending champions wins 7-5, 7-6 (4), 6-3Alexander Zverev defeats Jiri Lehecka in four setsSince coming through his first-round match here in five sets, Jannik Sinner has prioritised efficiency. His 7-5, 7-6 (4), 6-3 win against Jan-Lennard Struff was the defending champions fourth consecutive victory in straight sets, keeping his powder dry and any potential problems with the heat at bay, just over five weeks since his physical meltdown at Roland Garros.Thanks for reminding me, he told the on-...