Katie Boulter crashes out of US Open after Karolina Muchova nightmare

British No 1 outclassed 6-1, 6-0 in second roundBoulter’s recent poor form continues in New YorkWith the grounds of the Billie Jean King National Tennis Centre at a standstill in the middle of a furious downpour and all eyes on the two stadium courts played under retractable roofs, there was nowhere...