Tiafoe tops Medvedev in straight
NEW YORK: American Frances Tiafoe swept previous former champion Daniil Medvedev in straight units Sunday to advance to the quarter-finals of the US Open. A two-time semi-finalist at New York’s Flushing Meadows, the Eleventh-seeded Tiafoe defeated seventh-seeded Medvedev of Russia 7-6 (7/1), 6-4, 7-6 (8/6) to achieve the quarter-finals for the fourth time in 5…