Dallas Mavericks owner Mark Cuban has had it in for Tribune basketball writer Sam Smith for awhile. Now's he's upset that Smith called Mavericks draftee Pavel Podkolzine a "stiff" and issues the following challenge: "I will donate $10,000 to the charity of your choice if you can prove that you have ever seen Pavel play in person or on tape ... If you lose, you change your business card title and Tribune byline to 'Sports Gossip Columnist.' I will even pay for the cards."