Golding and his Czech partner Jiri Vesely, the fourth seeds, beat US pair Daniel Kosakowski and Dennis Novikov 4-6 6-3 10-6 while Morgan and France's Mathias Bourgue defeated Canada's Pavel Krainik and Giammarco Micolani of Italy 4-6 6-3 10-5.
BBC: Robson reaches last 16 at junior US Open