Bianca Andreescu has withdrawn from the WTA Finals in Shenzhen due to an injury to her left knee.

The 19-year-old, who won the US Open this year, was forced to retire from her match against Karolina Pliskova yesterday.

Speaking about her withdrawal, the Canadian said: “I had a scan Thursday to check my knee after last night’s match and unfortunately the results show that I need to withdraw.

“I twisted my knee during a forehand return, I heard a crack. After that it was hard to put pressure on it. On the spot, the physio thought it was my meniscus, so she taped it up. 

"It was really hard to bend with the taping and the pain kept getting worse, so I had to stop. I fought with what I had, but I didn't want to get it worse.

“It was amazing to play here in Shenzhen at the end of this incredible season. I’m very disappointed to not be able to finish the year on my terms, but I am hopeful I will have more chances to play here in the future.”

Andreescu is the third player to retire this week, after Naomi Osaka withdrew with a shoulder problem and her replacement Kiki Bertens had to stop her match against Belinda Bencic due to a viral illness.