Duffy (Achilles) ran the bases Thursday, Alex Pavlovic of CSN Bay Area reports.
He cleared a significant hurdle by running the bases -- the activity was said to have gone "really well" -- and Duffy now appears on the verge of beginning a rehab assignment. The 25-year-old could join an affiliate at some point this weekend. It's uncertain how long Duffy will need in the minors to prepare for a return, but with Joe Panik back, Hunter Pence (hamstring) nearing activation and Duffy getting close, it looks the Giants' lineup will be back at full strength early next month.