Mark Cuban tells TMZ Sports ... he will DEFINITELY be in the Staples Center Thursday night when his Mavs take on the Clippers ... more than 3 months after the infamous DeAndre Jordan flip flop incident.
You know the backstory ... Jordan made a handshake deal with the Mavs over the summer (4 years, $80 mil) only to back out and re-sign with the Clippers.
Cuban was clearly pissed about the situation -- but says he got over it -- and DeAndre eventually issued a public apology to Mark.
Still, you KNOW how bad Cuban wants to win this game tonight.
We also asked Cuban if he had any plans to speak with DeAndre -- his response? Nope.