Giants Baseball Prospect: Buster Posey

San Francisco Giants Prospect: Buster Posey As baseball approaches the mid-way point, big stars get bigger and up and coming stars are about to get the chance of a lifetime. The first move could come if the Giants decide to move Buster Posey up. Sources basically indicate that Posey is headed up but to play first base, not catcher. So, even if he shows up in San Francisco as expected, fans will have to wait to see what position he takes on the field. The Giants first basemen, Aubrey Huff, has spent a great deal of time in left field lately. And Buster Posey has been seen playing first base for the Class AAA Fresno squad. While hanging out on first, Posey has managed to hit .349 with six homeruns. The Giants are struggling and could definitely use a jolt from a player like Posey.