PARIS :World number one Jannik Sinner flattened Jiri Lehecka into the French Open clay to make the fourth round but a trio of American women led by Coco Gauff had to dig deep to progress on Saturday. As grey skies enveloped Roland Garros in the morning, Sinner won the opening 11 games against Czech Lehecka as fans checked their watches against the scoreboard in disbelief. Lehecka drew loud cheers when he finally got on the board but Sinner continued his masterclass with brutal clarity to secure