Either Mikhail Prokhorov and Mark Cuban are homeboys...or these guys genuinely don't like one another. We can't tell! A couple of days after the Mavs won the NBA 'chip, the Nets billionaire owner released a letter to congratulate Cubes on the victory—a nice gesture considering no other NBA owners offered up any praise—but he also took the time to take a small shot at him as well.

"My heartiest congratulations on winning the NBA championship," wrote Prokhorov, who has engaged in a war of words with Cuban in the past. "You showed the world not only what a great team you have, but also, that you can remain silent for a period of weeks—I don't know which is more shocking."

Hmmmm.....Did you forget to write "J/K" after that sentence, Proko? [via SB Nation]