Sam Zell, the chief of Tribune Co., which owns baseball's Cubs, may be close to a deal to sell Wrigley Field to the Illinois Sports Facilities Authority, which claims it can raise private money for renovations. Selling off the ballpark would pave the way to sell the team (Zell has said he wants separate deals for the stadium and team). On a separate note, the Tribune reports that Dallas Mavericks owner Mark Cuban, thought to be a long shot candidate to buy the Cubs, will be taking in tonight's game against the Brewers.