Strasburg (back) was throwing on flat ground Wednesday, Chelsea Janes of the Washington Post reports.
The Nationals are hopeful that their ace will be ready to make his next start against Milwaukee on Sunday after being a late scratch for Monday's outing. He seemed to look fine during his throwing session Wednesday and the Nationals want to announce whether he is starting a couple days before his next scheduled outing to avoid Monday's predicament. In the case that Strasburg is not able to go, Yusmeiro Petit will likely take the mound again Sunday.