Nick Kyrgios and Bernard Tomic were Tuesday included in Australia`s Davis Cup team to face Slovakia in a must-win tie to secure their place in the World Group next year.
Dimitrov committed 43 unforced errors as Murray set up a last-eight clash with Japanese sixth seed Kei Nishikori, the 2014 runner-up who downed 37-year-old Ivo Karlovic 6-3, 6-4, 7-6 (7/4).
Seventh seeds Sania Mirza and her Czech partner Barbora Krejcikova defeated unseeded American-Japanese pair of Nicole Gibbs and Nao Hibino 6-4,7-5 in a third round match.
Serena Williams will face Simona Halep for a place in the semi-finals after the Romanian fifth seed dispatched Spain`s Carla Suarez Navarro 6-2, 7-5.
Venus Williams was philosophical about her failure to convert a match point against Pliskova`s serve in the 10th game of the third.
"I just gave everything I had," said Halep.
Sania Mirza is the lone surviving Indian in the tournament.
Rafael Nadal vs Novak Djokovic was a contest fans were looking forward to in the semis of US Open 2016.
"Feels great to play a full match after a weird couple of days when I didn't have too much tennis," said Djokovic.
Venus is into the fourth round for the second straight season, having gone four years without passing round three while she learned to cope with Sjogren’s syndrome, an auto-immune disease that causes chronic fatigue and muscle soreness.
The taut battle came down to the fifth-set tiebreaker and Nadal, trailing 3-6, showed his mettle by saving three match points -- the third on Pouille`s serve.
Barbora and Marin will now take on seventh seeded Americans Coco Vandeweghe and Rajeev Ram in the quarter-finals.
The fourth-round match had a grand slam pedigree to it with Kerber, the Australian Open champion, going against twice Wimbledon winner Kvitova, but it failed to deliver any major excitement.
Sevastova thus became the first Latvian woman in 22 years to reach a Grand Slam quarter-final.
Relationship with all. When two neighbours fight both homes are effected.