Williams, who has been ranked number one by the Women's Tennis Association five times, hit Baltimore Ravens lineman Bryant McKinnie's studio in Florida when no one was looking to record some songs last year and TMZ.com
released a song that features the tennis star rapping for over a minute.
In the sample, Williams raps about her skills on and off the tennis court.
"I ball hard no tennis racket/ I can't see these haters through my Gucci glasses/ I make hits like batting practice/ they be like Baby, Serena, is you really rapping?" she said. "That's me, thanks for listening."
According to the Christian Post
, the tennis star also uses the song to reference her sister Venus Williams.
"I win I really mean it/ Swag out this world you should call me Venus," she boasted. "That's my sis, my name is Serena/ On the court I serve them up, no subpoena."
On Twitter, reviews ranged from encouraging to disbelieving, starting with the budding rapper herself.
Some critics had questions about lyrics such as:
"I put the track up like a frozen pizza. Beats so crazy it might blow your speakers."
she rapped. "Schooling these rappers, they should pay tuition."
Despite the negative reaction to her rap, Williams still received support. NY Daily News
gave the part-owner of the Miami Dolphins thumbs up.
"Judging by the untitled track, the 30-year-old former No. 1 player is a lot better than a lot of other athletes turned wanna-be rappers," the site said.
If the rap thing doesn't work out, Williams still has a pretty good career in tennis to fall back on, said the NY Daily News.
In her day job today, Williams beat Maria Sharapova 6-1, 6-3 in a Madrid Open quarterfinal, the Washington Post