Tiafoe, Fritz and Navarro boost home hopes of US Open title sweep

Frances Tiafoe and Taylor Fritz set up an all-American US Open semi-final on Tuesday as compatriot Emma Navarro reached the women's last four to boost home hopes of a title sweep.Navarro, playing in front of her home New York crowd, broke through to a maiden Slam semi-final by defeating Paula Badosa of Spain 6-2, 7-5 after coming back from 5-1 down in the second set.