A blockbuster could be in the works.
A variety of three-, four- and even five-team trades are in play at the winter meetings, mostly involving the same clubs and same principal players, according to major-league sources.
The clubs: Arizona, Cleveland, Texas and Tampa Bay.
The principal players: Diamondbacks right fielder Justin Upton, Indians shortstop Asdrubal Cabrera, Rays right-hander James Shields and, most likely, Texas prospects.
One proposed deal, according to sources, would send Upton to Texas and Cabrera to Arizona, with Cleveland likely receiving a package of young talent, possibly including Texas infielder Mike Olt (Tampa Bay would not be part of that particular trade).
None of the deals was close as of early Wednesday morning, and none is likely to come to fruition, considering the difficulty of putting such trades together, sources said.
In fact, the number of players and prospects under discussion is so vast, some club officials involved in the talks are not even...