ROME: Jannik Sinner marched into the semifinals of the Italian Open on Wednesday after destroying Casper Ruud in straight sets 6-0, 6-1 and sending a warning that the world number one is officially back. Ruud was supposed to be Sinner’s toughest test in Rome since he came back from his three-month doping ban, as the Norwegian came into the match in hot form on clay after winning in Madrid earlier this month.