Rapper YBN Cordae is livin' the dream right now -- he's got a tennis superstar girlfriend, he made XXL's prestigious "Freshman Class" list, and he just dropped a debut album that's getting great reviews.
Yeah ... that's probably why the dude was so chipper when we saw him out in NYC!!!
As we previously reported ... the 21-year-old and Naomi Osaka -- #2-ranked tennis player in the world -- were getting close back in April and spending a lot of time together.
The young couple is officially official now (our source is pretty rock solid) ... but Cordae makes it clear he has to earn every dub ... at least on the tennis court.
Cordae says his tennis skills are improving ... but tells us Naomi doesn't take it easy on him.