Rafael Nadal's return to action came to a shuddering halt when the Spaniard was beaten by Slovakia's Martin Klizan in the quarter-final at the China Open.
The top-seeded Djokovic defeated Wimbledon semi-finalist Dimitrov of Bulgaria 6-2, 6-4, while sixth-seeded Murray took out US Open champion Cilic 6-1, 6-4.
The top-ranked Serena Williams had been due to face Australian Samantha Stosur in the quarter-finals on Friday.
Nadal reached his first quarter-final since capturing his record ninth French Open title in June with a 6-3, 6-4 win over Gojowczyk at the China Open on Thursday.
Halep won a back-and-forth match against Petkovic featuring 17 breaks of serve, beating the German 7-6 (4), 5-7, 7-6 (1) to advance to the China Open quarter-finals.
Venus Williams withdrew from the China Open with a viral illness on Thursday shortly before her third-round match against Petra Kvitova.
Petra Kvitova and Venus Williams will meet in the third round of the China Open in a reprise of their dramatic, three-set encounter at Wimbledon.
It was a fitting goodbye for China's biggest tennis star, complete with hugs from her former competitors, cheers from Chinese fans, and a bouquet of flowers from Nadal.
Nadal made a dominant return to tennis after a two-month injury layoff, beating Richard Gasquet 6-4, 6-0 in the first round of China Open.
Maria Sharapova moved into the third round of the China Open with ease, while Poland's Agnieszka Radwanska late-season slump continued with another early loss.
Serena narrowly avoided a bagel against Soler-Espinosa, then won 13 of the next 15 games to pull out a 7-5, 6-2 victory in the first round of the China Open.
Sharapova overcame six double-faults to defeat Kanepi 6-4, 6-1, while the Williams came back from a 3-0 deficit in the opening set to defeat Watson 6-3, 6-1.
Nadal hasn't played a match since losing in Wimbledon to Nick Kyrgios. He injured his wrist while practicing on his home island of Mallorca.
Pallikal, who has slipped out of top-10, next faces an unexpected opponent in qualifier Salma Hany Ibrahim.
Saina overcame Japan's Nozomi Okuhara 21-14 21-19, while Kashyap recorded his fourth victory over Thai Boonsak Ponsana 22-20 21-15.
Despite Federer's recent drop in play, Rod Laver thinks the Swiss star is still the greatest player of his generation.
Williams bagged her 10th title of the year with a 6-2, 6-2 thrashing of Jelena Jankovic in the final of the China Open.
Novak Djokovic overcame Rafael Nadal in straight sets on Sunday to win the China Open for the fourth time in five years.
As she closed her 2013 season with a bang by winning the China Open, Sania Mirza avowed that she is a better player compared to what she was last year.
Serena Williams and Serbian Jelena Jankovic set up a final showdown in the China Open after their contrasting victories in the semi-finals.
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