The 2012 U.S. Open champion breezed beyond Italy's Andreas Seppi to set up a last-eight meeting with Croatia's Marin Cilic, who upset fifth seed Jo-Wilfried Tsonga.

CNN: Haas stuns Djokovic in Miami

Watson, a quarter-finalist in this year's Australian Open juniors, held the opening game of the second set and broke again to go 2-0 up.

BBC: Watson wins US Open girls' title

Britain's first dedicated anti-doping body (UKAD) is set to open on 14 December will take on the responsibility for drug testing from UK Sport.

BBC: Anti-doping plans worry athletes