Five-time Grand Slam winner Maria Sharapova suffered a shock defeat in the first round of the Qatar Open on Monday, dumped out in three sets by outsider Monica Niculescu.
Roger Federer and Novak Djokovic kept up their relentless march towards a semi-final meeting at the Australian Open Saturday
Maria Sharapova was sent crashing out of the Australian Open in a crushing defeat by Angelique Kerber Saturday as Simona Halep survived a titanic struggle to make the last 16.
Djokovic plays Spain's 21st seed Albert Ramos-Vinolas in the third round.
Milos Raonic was stunned by Lukas Lacko in the first round of the tournament.
Siniakova, the sixth seed, beat the 30-year-old 6-2, 3-6, 6-3 and will face world number one Simona Halep in the final.
Five-time Grand Slam champion Sharapova, making her Shenzhen debut, despatched Romania's world number 56 Mihaela Buzarnescu 6-3, 6-0 in an hour and 20 minutes.
Maria Sharapova is under investigation in India after the collapse of a luxury housing project she had endorsed.
Five-time Grand Slam champion Maria Sharapova is under investigation by Indian police for cheating and criminal conspiracy after the collapse of a luxury housing project that she endorsed, a lawyer said on Tuesday.
Maria Sharapova crashed out in the first round of the Kremlin Cup in Moscow on Tuesday, losing in straight sets to Slovakia's Magdalena Rybarikova.
The former world number one, who returned to action in April, came from behind in both sets and needed four championship points in the tie-breaker before beating the 19-year-old 7-5, 7-6 (10/8).
The 30-year-old Russian, playing on a wildcard in the seventh tournament of her comeback, hit top gear as she swept aside the Chinese third seed in one hour, 18 minutes.
Maria Sharapova was emphatically dumped out of the China Open in the third round on Wednesday by Simona Halep, going down 6-2, 6-2 to Romania's world number two.
Maria Sharapova remains a crowd favourite in China despite her doping ban.
The five-time Grand Slam winner Maria Sharapova racked up eight double faults through the first two sets before swiftly sealing the match in the decider
The Russian-born Sharapova was 17 when she defeated Williams in the 2004 Wimbledon final. Rather than proving the start of a long, close-run rivalry, it was one of just two victories Sharapova can claim against the US great, who has beaten her 19 times.
Maria Sharapova is expected to jump from 146th to around 100th in the world rankings.
Wozniacki was furious that her second round match was played on an outside court while five-time major winner Sharapova was playing all of hers in Arthur Ashe Stadium.