The Cubs activated Merryweather (ribs) from the 60-day injured list Monday.
Merryweather has missed most of this season with a rib stress fracture but is ready to go after allowing one run with a 5:0 K:BB over 4.2 innings during his rehab assignment. The hard-throwing right-hander should handle high-leverage spots for the Cubs, though he might be eased back into such situations.