Christina Kahrl MLB Staff Writer
Calling up Franklin Barreto is interesting for its timing. The A's No. 1 prospect in Keith Law's pre-season ranking (No. 56 on the top 100) put up a decent, not amazing .754 OPS in Triple-A. Top prospects usually don't shuttle up and down, but it might look like the window at shortstop is open between Chad Pinder's strained hamstring and Marcus Semien's rehab -- unless the A's want to shake up baseball's worst defense by making some position switches, or act on those Jed Lowrie trade rumors.