Clarke (arm) was activated from High-A Peoria's 60-day injured list Tuesday.
Clarke had surgery in January to address an aneurysm in his left arm, delaying his season debut until mid-July. In four rehab outings, the lefty permitted five runs (four earned) with a 10:7 K:BB over 7.1 innings. Clarke has electric stuff, but he'll need to improve his control and durability to reach his immense ceiling.