Serena Williams has withdrawn from the season endingย WTA Championships due to injury.

Williams, who recently lost her world No.1 ranking to German Angelique Kerber, postedย a short video on social media explaining her decision to her fans.

โ€œIt's been a really tough year for me, dealing with these shoulder injuries,โ€ Serena said.

โ€œMy doctor insists that I stay home and heal it.

โ€œI only have wonderful memories of playing in Singapore and I will really miss my fans.

โ€œI want to wish everyone a great time and I hope it will be an amazing tournament โ€“ it always is.โ€