| The 22-times grand slam singles champion has played only 
				eight tournaments this year and lost her top rankings to German 
				Angelique Kerber.
 "It's been a really tough year for me, dealing with these 
				shoulder injuries. My doctor insists that I stay home and heal 
				it. I only have wonderful memories of playing in Singapore and I 
				will really miss my fans," the 35-year-old said in a video on 
				the WTA website.
 
 Williams, who also missed Wuhan Open and China Open and a 
				tournament in Cincinnati this year, added that she will be "off
 
 court for the next several weeks".
 
 The American arrived at the year's U.S Open with concerns around 
				a sore shoulder from the Rio Olympics in August and was beaten 
				by Czech 10th seed Karolina Pliskova in the semi-final at the 
				Flushing Meadows.
 
 Williams, who had also pulled out of last year's WTA Finals, has 
				won two titles this year, in Rome and at Wimbledon, where she 
				matched Steffi Graf's professional era record of 22 grand slam 
				singles titles.
 
 Kerber, Simona Halep, Agnieszka Radwanska, Karolina Pliskova and 
				Garbine Muguruza, Madison Keys and Dominika Cibulkova have 
				already qualified for the WTA Finals starting on Sunday.
 
 (Reporting by Ian Rodricks in Bengaluru; editing by Amlan 
				Chakraborty)
 
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