LONDON, July 7 : American Coco Gauff and Germany's Alexander Zverev both broke new ground at Wimbledon on Tuesday but Naomi Osaka's title hopes evaporated on a boiling hot day at the All England Club.Hot weather warnings might have furrowed the brow of men's defending champion Jannik Sinner but he tamed German veteran Jan-Lennard Struff 7-5 7-6(4) 6-3 to reach the semi-finals.Seventh seed Gauff's relationship with grass has been lukewarm since she made her Wimbledon debut as a 15-year-old in 2019 and had never gone past the fourth round.The bond is clearly getting stronger though as she proved with a composed 4-6 6-3 6-3 victory over American number one Jessica Pegula on Centre Court. OSAKA'S BID FOR FIFTH MAJOR HALTEDZverev, whose Wimbledon ceiling had also previously been the fourth roun