India, Oct. 16 -- Jannik Sinner got his title defence at the exhibition Six Kings Slam tournament underway in Riyadh, Saudi Arabia with a comfortable and commanding victory over Stefanos Tsitsipas in the quarterfinal round. Sinner only needed 76 minutes to brush past the Greek, dropping only five games and setting up a semifinal to savour against Novak Djokovic.

It was business as usual for Sinner, who continues to look a class apart from much of the tour. He bounced back well from his injury-enforced withdrawal from the Shanghai Masters. There was very little drama to a match that Sinner dominated from start to finish - but a slightly bizarre and concerning scene did unfold at the end of this match in Riyadh, which has led fans to quest...