Serena Williams will not be Tokyo-bound this Summer ... because she just said she's not heading to the Olympics.
It's a big blow for the games losing that kind of star power -- Serena snagged 4 gold medals in prior years, most recently in 2012.
She said Sunday at Wimbledon, "I'm actually not on the Olympic list, not that I'm aware of," adding, "If so, then I shouldn't be on it."
If that sounds a little vague, Serena cleared it up with this ... "There's a lot of reasons that I made my Olympic decision. I don't really want to. I don't feel like going into them today. Maybe another day. Sorry."
Still not enough? Well, she ended with this ... "I have not thought about it. In the past [the Olympics] has been a wonderful place for me. I really haven't thought about it, so I'm going to keep not thinking about it."