Eric Surkamp is currently scheduled to start for the Oakland A's on Tuesday against the Rangers, but Jesse Hahn might get the call instead according to John Hickey of the Bay Area News Group. Hahn was previously scheduled to start for the Triple-A Nashville Sounds that day, but Nashville's official site now lists Dillon Overton on Tuesday.
This might seem like an obvious move, but it's more complicated than just Hahn being a better option than Surkamp. Hahn was optioned to the minors on May 8, and players on optional assignment must stay down for at least 10 days -- that means Hahn shouldn't be eligible to return until Wed.