Bruce Chen has been scratched from his scheduled start Thursday due to a tight left glute muscle. Chen said he's been dealing with the tweaked glute for about a week, which might explain the Twins getting to him for six runs in 3 2/3 innings his last time out. James Shields' start was bumped up to Thursday to accommodate, and the hope is that Chen will be ready to start Saturday's game -- a rematch with those Twins -- instead.