Per ESPN, Williams has withdrawn from the upcoming Australian Open, the tournament which she won past year while two months pregnant.
Williams announced on Friday that she would not be defending her title in Melbourne after realising she wasn't up to speed physically in an exhibition encounter in Abu Dhabi last week.
"After competing in Abu Dhabi I realized that although I am superclose, I'm not where I personally want to be", Williams said in a statement Friday.
"I can compete - but I don't want to just compete".
Tournament director Craig Tiley called Williams's efforts to try and be ready for a title defence at the Australian Open "Herculean" and said she transcended the sport.
Serena Williams has withdrawn from the season-opening Grand Slam in Melbourne and will not defend the title she won in 2017.
"The memory of last year's Open is one that I will carry with me, and Olympia and I look forward to coming back again".
The American tennis star had had a baby girl about four months ago and hasn't played competitive tennis since winning the Australia Open 2017 during which she was pregnant.
Despite this, she made it clear afterwards that she missed being on court and was desperate to play at Melbourne Park, where she has been crowned champion seven times.
The seven-time Australian Open champion confirmed Friday she wouldn't attempt to defend the title she won here previous year, saying she wasn't convinced she could win it. "It was never going to be good enough for her to just compete, she wants to give herself the best chance to win".
"I've been in constant contact with Serena and her team and know this is why she has pushed it and pushed it until the eleventh hour to make her final decision".
Stan Wawrinka: the 2014 Open champion also hasn't been sighted in six months as he battles a knee injury that will restrict his build-up to next week's one- night Tie Break Tens. "There are a couple of exhibition events down there that she may choose to play in".
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