SINGAPORE: US superstar Serena Williams has withdrawn from the elite WTA Finals in Singapore, saying she’s still working to recover from the shoulder troubles that hindered her in 2016. The WTA announced Williams’ withdrawal from the event that starts on October 23 on their Twitter feed, posting a video of Williams explaining the decision. “Hey everyone in Singapore,” Williams said. “I’m really, really bummed that I won’t be able to come compete this year. It’s been a really tough year for me just dealing so much with these shoulder injuries. My doctor insists that I stay home and heal it every single day.” It will be the second straight year that Williams is skipping the season finale in Singapore due to injury. The 22-time Grand Slam champion earlier pulled out of two tournaments in China after being knocked out of the semi-finals of the US Open.