Serena Williams has withdrawn from the season-ending WTA Finals in Singapore later this month citing a persistent shoulder injury, the world number two said on Monday.
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.
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