However, Carlos' announcement that he will not play the Shanghai Open due to his ankle injury opens the door for Sinner to regain the title of the World No. In the best case scenario for Sinner, he would retain those 1,000 points (if he wins Shanghai Masters again). After October 12, Alcaraz will drop to 11,340 points and Sinner, if he wins, would remain the same: 390 points behind Alcaraz. ErreRoberto / ShutterstockVienna, an unexpectedly key date for SinnerAfter that, the first ATP tournament is Vienna Open between October 20-26. But let's take it step by step, as the Shanghai Open is underway, with Sinner expected to debut in second round on Friday.