Detroit, MI (SportsNetwork.com) - The Oakland Athletics activated reliever Eric O'Flaherty from the 15-day disabled list on Tuesday.

O'Flaherty posted an 0-2 record with an 11.57 earned run average over eight relief appearances before landing on the DL with a strained left shoulder on May 2.

In a corresponding move, the A's optioned pitcher Angel Castro to Triple-A Nashville.