Coco Gauff’s Wimbledon challenge came unstuck in the third round on Saturday when she was beaten by familiar foe Amanda Anisimova 6-7 6-2 6-1 in an all-American showdown. The two Florida-based players had made their way through the junior ranks at the same time, with Anisimova thrashing Gauff to win the U.S. Open junior title in 2017. Yet during the …