While the Pirates have been linked to nearly every first baseman on the market, ESPN's Jayson Stark reports (via Twitter) that the Astros are also calling clubs about potentially available first basemen. Stark says Houston has placed calls on Mike Carp, John Mayberry and Tyler Moore, though he classifies each of the three as an "unlikely fit." That the Astros are seeking a first baseman is a bit curious, given top prospect Jonathan Singleton's presence at Triple-A. He figures to be their long-term solution at the position, though none of the three listed by Stark is exactly the type of...

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