Naomi Osaka Getting Close with Rapper YBN Cordae, Not 'Official' Yet

Naomi Osaka is VERY close to being off the market ... 'cause the #1-ranked women's tennis player in the world is getting REAL close with rapper YBN Cordae!!!

In fact, Cordae made a recent cameo on Naomi's IG -- leading many to think the appearance was their public coming out party.

But, sources close to the two tell TMZ Sports ... while they're spending a lot of time together lately -- and they like each other -- they're not "officially" an item. At least, not yet.

As one source put it, "Just give it a week."

21-year-old Osaka has been a BEAST on the pro tennis circuit -- famously beating Serena Williams at the U.S. Open back in 2018. She was also just named in Time's 100 most influential people.

21-year-old Cordae is a fast-rising star in the rap game -- he's backed by Dr. Dre and recently hung out with Diddy. He's the real deal.

Cordae is part of the YBN collective -- one of the hottest young groups in music. He is also expected to be named to XXL's Freshman list in 2019.

Just this week, Osaka posted a video with Cordae -- and captioned it, "Can’t take this guy anywhereeeee lol"