There is really only one highly talented pitcher available on the open market, and that pitcher is Rich Hill.
Just about any A's fan who didn't spend all of last year hiding underneath a bed, head in hands, rocking back and forth while muttering "bad, bad, bad, bad, bad" for the duration of the season knows of Rich Hill's highly improbable and highly impactful return to the big leagues. But just to quickly recap, after getting drafted in the fourth round in 2002, Hill made his major league debut in 2005 armed with what many were touting as the curviest curveball in all of baseball, but issues with controlling his primary weapon prevented him from ever finding any sort of consistency.