Sinner in the most devilish form at Roland Garros

Poor old Jiri Lehecka will not forget the day he ran into the world no.1 Jannik Sinner at his most demonically ruthless — and still earned a standing ovation.

Lehecka is no mug, a 23-year-old Czech who reached the Australian Open a couple of years ago, who’s been on the verge of the top 20 and…