Lorenzen (shoulder) played catch Tuesday as the beginning of a throwing program, Rhett Bollinger of MLB.com reports.
Lorenzen went on the 15-day IL on July 7 due to a right shoulder strain. A subsequent MRI revealed no structural damage, and he's now been able to resume throwing. Lorenzen doesn't have a concrete timeline for a return, but he could be back soon after the All-Star break.