ATP roundup: Daniil Medvedev headlines day of sweeps at Vienna after win against Fils
Djokovic propels Serbia into Davis Cup quarter-finals, Britain defeat Switzerland
Davis Cup champions Canada stay perfect as US stunned by the Netherlands
Britain see off Australia but Spain and Italy lose in Davis Cup
'Nothing to lose', Fritz guns for Djokovic upset at US Open
Djokovic enjoys drama-free win to reach US Open quarters
ATP roundup: Frances Tiafoe advances in Washington, whilst Nakashima edges Vukic
