The Reds have activated left-hander Sean Marshall from the disabled list, sending left-hander Manny Parra to the 15-day disabled list with a strained left pectoral muscle. Parra’s DL stint is retroactive to Wednesday. Marshall was placed on the 15-day disabled list on April 10 with tendinitis in his left shoulder. He made two rehab appearances this week and was already in Washington with the team. Marshall’s line appearance this season was on April 7 against the Nationals, before he was put on the DL.