Jannik Sinner apologised to the umpire after going well over his allotted 25 seconds on the serve clock. Straight after, the Italian sent an absolute ripper down the court to leave Jack Draper stumbling to land the ace. The serve clock has been utilised in ATP and WTA tour events in a bid to quicken up games. It was first introduced in 2018 and before it became widespread at tournaments in 2020. But during the second set of their US Open semi-final, Sinner was guilty of going well over the allotted 25 seconds. The world No. 1 had turned to use a towel and seemed oblivious to the clock timer, w…
