Serena Williams said she will not have any second thought about skipping the remainder of the WTA season, including the WTA Tour finals in Singapore, once she found out that her injured knee is not okay.

Williams, who recently withdrew from the China Open because of a knee injury, told the press that she's going to have an MRI in Europe this week and assess whether finishing this year's campaign is still ideal.

"If I feel this way for Singapore, I don't think it's smart for me to play," Williams told the press following her decision to skip China Open. "I'm just going to see how it goes."  

Struggling to stay healthy all season-long, the knee injury is just one of myriad of injuries Williams had to endure. Two months ago, Serena bowed out early in the women's singles and doubles after she was inflicted with a stomach virus that unfortunately triggers so many speculations - including a possible pregnancy.

But Williams downplayed all false rumors by bagging her 18th Grand Slam title in Flushing Meadows in September. She had plan to continue her domination in the Asian circuit of the WTA tour, but her knee unfortunately swelled terribly in the game against Alize Cornet - the first person since Justine Henin to beat Williams on three separate occasion in one year.

 "I started to feel pain this week," Williams told the press last Friday via Washington Post. "It didn't feel really well last night at all. I almost didn't go on the court [against Cornet] - I did at the last minute. I think it made it a little worse, to be honest."

"It throbs just sitting, standing. I felt it mostly serving because I'm landing on my left knee. That was really killer for me. ... As a defending champ, you always want to do your best to defend your title. That's why I played yesterday. I've got to at least give it a chance. To come all this way and not to take the title, it's just a waste."

With Williams possibly out of the tour finals, newly-crowned world's no.2 Maria Sharapova could get the first seed in the tourney, while no.9 Caroline Wozniacki could benefit from Serena's absence by getting the last seed in the year-ending tourney.