Pakistan, July 27 -- US top seed Taylor Fritz dropped an early Saturday morning marathon to Spain's Alejandro Davidovich-Fokina while Britain's Emma Raducanu and Canada's Leylah Fernandez reached the semi-finals of the ATP and WTA DC Open.

World number four Fritz, two points from victory in the ninth game, dropped the last five games in falling to the 26th-ranked Spaniard 7-6 (7/3), 3-6, 7-5 after three hours and five minutes in a match ending just before 2:00 am. Davidovich-Fokina advanced to a Saturday semi-final against US fourth seed Ben Shelton, who beat sixth-seeded hometown hero Frances Tiafoe 7-6 (7/2), 6-4.

Fritz, who had 20 aces and six double faults, served for the match in the ninth and was up 30-0 but lost, then failed to t...