Roger Federer has delivered a tennis masterclass to send Nick Kyrgios out of the US Open in New York. The 20-times grand slam champion produced some breathtaking shot-making at times in sweeping past Kyrgios 6-4, 6-1, 7-5 in their much-hyped third-round showdown at Arthur Ashe Stadium. Federer’s emphatic victory set up a last-16 meeting with another Australian, unseeded journeyman John …