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			 Williams was pooled in the Red Group on Saturday for the WTA's 
			season ending event alongside Romanian Simona Halep, Canada's 
			Eugenie Bouchard and Serbia's Ana Ivanovic who have managed only one 
			career victory among them against the 18-times grand slam singles 
			champion. 
			 
			The more competitive looking White Group features Russian Maria 
			Sharapova, Wimbledon champion Petra Kvitova, Poland's Agnieszka 
			Radwanska and Caroline Wozniacki of Denmark. 
			 
			Williams is gunning for her fifth season ending championships win 
			and third straight, having taken the last two titles in Istanbul. 
			 
			Her participation in this year's event, which switches to Singapore 
			for the first of five editions, was in doubt after she was forced to 
			pull out of the Beijing tournament earlier this month because of a 
			knee problem. 
			
			   
			 
			Bouchard is also a fitness doubt after pulling out of a tournament 
			in Austria 10 days ago because of a leg problem, while Ivanovic, who 
			has a 1-7 win-loss record against Williams, also withdrew from Linz 
			with a hip injury. 
			 
			Romanian Halep has struggled for form of late and not made it past 
			the quarter-finals of an event since July. The French Open runner-up 
			is 0-3 against the American. 
			 
			Sharapova, who beat world number three Halep in the final at Roland 
			Garros, has had no such issue with form and was named the WTA's 
			Player of the Month for September after winning the prestigious 
			Beijing title, her last action before arriving in Singapore. 
			 
			There she beat Kvitova in the final, with the Czech just missing out 
			on back-to-back titles having won the week before in Wuhan. 
			 
			The two will be favorites to grab the two semi-final berths from the 
			tricky White Group but will face stiff competition from former world 
			number one Wozniacki, who has also shown strong form in the tail end 
			of the season. 
			 
			
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			The Dane was runner-up to Williams at the U.S. Open, made the 
			finals in Tokyo and the semis in Wuhan to book a spot in Singapore. 
			 
			The action gets underway on Monday at Singapore's revamped indoor 
			stadium, which forms part of the city-state's new $1 billion Sports 
			Hub. 
			 
			Red Group 
			 
			1-Serena Williams (United States) 
			 
			4-Simona Halep (Romania) 
			 
			5-Eugenie Bouchard (Canada) 
			 
			7-Ana Ivanovic (Serbia) 
			 
			White Group 
			 
			2-Maria Sharapova (Russia) 
			 
			3-Petra Kvitova (Czech Republic) 
			 
			6-Agnieszka Radwanska (Poland) 
			 
			8-Caroline Wozniacki (Denmark) 
			 
			(Editing by Amlan Chakraborty) 
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