Wozniacki served for the match at 5-4 in 3rd set but Serena broke back and won the tiebreaker and match.
The Spaniard also needed treatment for appendicitis this month in Shanghai.
Serena Williams takes the year-end top ranking for the fourth time, beside she achieved the feat in 2002, 2009 and 2013.
Sharapova needed to win in straight sets to stand any chance of advancing to the semi-finals.
It was the American’s worst loss since her defeat by Kruger in the quarter-finals at Oklahoma City in 1998.
Halep took Serena back 16 years to a time when, as a teenager, she was trying to make a name for herself.
Nadal notches up no nonsense 6-2, 6-2 win over Simone Bolelli in Swiss Indoors on Monday.
The Dane grabbed the final qualifying spot but it was Sharapova who looked the lower ranked player.
Serena Williams puts aside storm over disparaging comments by ITF member to beat Ivanovic 6-4, 6-4.
Serena begins her WTA Finals title defence with a 6-4, 6-4 win over Ana Ivanovic in Singapore.
The WTA took swift action and fined Tarpishchev $25,000 and disqualified him from working in an organisational capacity.
The victory also boosted Murray’s chances of getting to the eight-man ATP finals in London next month.
Tarpishchev made an official apology on Saturday after a WTA demand to do so.
Tarpischev was fined and suspended for a year after referring to Serena and Venus Williams as “brothers’’.
The tour also said Tarpischev owes Venus and Serena Williams a personal apology.
The league, brainchild of Bhupathi, will begin on Nov 28 in Singapore and conclude on Dec 13 in UAE.
Soderling attained a career high ranking of No. 4 before he was struck by mononucleosis, which laid him low for months.
The 17-time Grand Slam singles champion won 7-6 (6) 7-6 (2) to register his first title in China.
Federer triumphed 7-6 (6) 7-6 (2) to register his 23rd Masters Series title and first in China.
Roger Federer ends Novak Djokovic’s unbeaten 28-match run in China; sets up date with unseeded Simon.
Federer beat Djokovic 6-4 6-4 in Shanghai to set up a final against unseeded Frenchman Gilles Simon.
Djokovic sets up semifinal against Roger Federer after thrashing Ferrer; Simon upsets Thomas Berdych.
Djokovic defeated Ferrer 6-4, 6-2 while Federer outplayed Julien Benneteau of France 7-6 (4), 6-0.
Djokovic and Federer win in contrasting styles to reach the Shanghai Masters quarters.
Djokovic broke Kukushkin in 5th game of 3rd set and went on to seal a quarter-final clash with Ferrer.
Suffering from appendicitis, Rafael Nadal succumbs to Feliciano Lopez; Roger Federer stages comeback.
An ailing Rafa Nadal added his name to the list of upsets at the Shanghai Masters.
Nadal said on Tuesday he chose to try treatment with antibiotics rather than undergo surgery right away.
Wang Chuhan caused a major shock when he knocked out 15th seed Fabio Fognini.
It proved a good day for big-servers as world number 14 John Isner belted down 22 aces to beat Spaniard Pablo Andujar 7-6(5) 1-6 6-3.
Cilic made a shock first-round exit from the Shanghai Masters on Monday after losing 7-5 2-6 7-6(2) to fellow Croatian.
Unwell since last one week, Sania said she was recovering well and looking forward to a break.
Novak Djokovic decimated Tomas Berdych 6-0 6-2 in the final. It was Djokovic’s fifth China Open title.
Top seed Djokovic took 66 minutes to seal a 6-0 6-2 win against Berdych, Sharapova prevails over Kvitova.
The 27-year-old Serb took an hour and 37 minutes to down Murray for an impressive 23-0 record in Beijing.
In the women’s tournament, Stosur will take on Wimbledon champion Petra Kvitova in the semis.