As reflected by the accurate-as-can-be score, this matchup was unusually topsy-turvy as they took turns dominating a set at a time. First, it was Sinner who was superior. Then that role was played Medvedev. Then Sinner regained the upper hand in the third. In the fourth, from 3-all, Sinner surged, saving a pair of break points, then breaking Medvedev to lead 5-3.