After beating up on Australians (James Duckworth, Matthew Ebden, Alex de Minaur) in the first three rounds, Rafael Nadal extended his winning run against US players at the majors to 21 matches with victory over Frances Tiafoe. You have to go back to James Blake’s third-round win at the 2005 US Open for his last Grand Slam loss to a US player, a streak the world No.39 never looked in danger of stopping.