Serena Williams is flirting with a tennis return once again -- the superstar says she is NOT retired ... and the chances of her playing are "very high."
The 23-time Grand Slam winner made the comment at TechCrunch Disrupt in San Francisco just days ago ... and it definitely sounds like she's got the itch to pick up the racket again.
"I'm not retired," Williams said.
In fact, Serena goes on to say there's a good chance fans will be able to watch her compete again ... but followed up with a joke.