• The A's claimed right-hander Will Harris off waivers from the Rockies on Wednesday and optioned him to Triple-A Sacramento. To clear a spot on the 40-man roster, the A's designated righty Josh Stinson -- claimed off waivers from the Brewers last week -- for assignment.
Harris, 28, made his Major League debut with Colorado last August and compiled an 8.15 ERA in 20 relief appearances. He had two saves and did not allow a run in three Spring Training appearances before he was optioned to Triple-A on March 15. He was designated for assignment Friday.
• Rehabbing infielders Hiroyuki Nakajima (left hamstring) and Adam Rosales (intercostal muscle), both on the disabled list, were back on the field doing some work on Wednesday. Nakajima was scheduled to do some stretching and throwing, while Rosales was to take part in similar activities. Melvin said Rosales' next step is hitting off a tee.