Texas Rangers second baseman Mike Richardt will be lost to the team for at least 12 weeks and possibly for the entire season with a knee injury suffered Thursday night in Baltimore.

Richardt was hurt on the final play of the Rangers' 3-2, 14-inning loss when the Orioles' Dan Ford slammed into him. Richardt had taken a throw from shortstop Bucky Dent, who had bobbled a double play grounder. The second baseman was knocked down before he could relay the ball to first, enabling the winning run to score from third base.

Richardt will undergo surgery Monday to determine the extent of the damage. Wayne Tolleson replaces Richardt in the starting lineup . . .

Boston businessman David Mugar is negotiating with the owners of the Red Sox to purchase almost 40 percent of the club's stock and make him a general partner, the Boston Globe has reported.

Mugar, chairman of WNEV-TV in Boston, would buy shares owned by four major holders led by general partner Edward (Buddy) LeRoux in a $15 million to $18 million deal that was expected to involve Red Sox veteran Carl Yastrzemski. If the deal is consummated, Yastrzemski is expected to assume a front-office position.