MESA, Ariz. -- The A's optioned starter Jesse Hahn to Triple-Nashville on Sunday and announced that lefty Ross Detwiler has opted out of his minor league contract to become a free agent.
Hahn got off to a strong start this spring but struggled mightily in his last two starts, giving up 12 earned runs combined.
His demotion brings Oakland's rotation into focus, with Andrew Triggs and Raul Alcantara lined up to take the final two spots in the rotation behind Kendall Graveman, Sean Manaea and Jharel Cotton. Sonny Gray will begin the season on the disabled list.