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 player who would block Singleton once he's ready for the Majors. This isn't the first we've heard of the Astros looking for first basemen this winter, however, as James Loney said that Houston made him a similar offer to the one he accepted from the Rays.
Carp was a key part of Boston's roster with a strong 2013 in which he slashed .296/.362/.523 with nine homers in a platoon capacity (he has long struggled against left-handed pitching). The Boston Globe's Nick Cafardo recently pegged him as a trade candidate, however, given a possible roster crunch. Mayberry and Moore seem like the types that would be more available in a trade, as neither has a clearly defined role on his respective team. In late January, it was reported that Mayberry could be moved in Spring Training. Going further back, FOX Sports' Ken Rosenthal reported in December that the Astros could be interested in Moore as a first base option.
For the time being, some combination of Jesus Guzman and Chris Carter figures to hold down the first base job in Houston while Singleton develops. The club also has Japhet Amador in camp as a non-roster invitee.