I'm Dead Serious About Buying WNBA's Dream

LeBron James might have some stiff competition (or a great partner!) if the WNBA's Atlanta Dream does go up for sale ... 'cause Renee Montgomery says she's dead serious about potentially buying the squad too.

"Listen, I'm interested," the WNBA star said on the "TMZ Sports" TV show on FS1 (which she co-hosts). "I think that people talking about it are actually serious. And, I'm actually serious."

Of course, the Dream is NOT for sale at the moment ... but team owner Kelly Loeffler -- who just lost her U.S. Senate run-off election in Georgia this week -- has become a villain in the league, and it's led to speculation a sale could be imminent.

In fact, it seems Loeffler's players would actually…