Nobody likes losing nine games in a row like the Reds recently did, but it happens. The Reds primarily suffer from poor pitching. Their bats are noticeably stronger than those of the Phillies, though both of those teams currently have 19 wins. The Reds rotation has been plagued by injuries. Homer Bailey is out entirely (Tommy John surgery). Johnny Queto has not pitched since the 19th (elbow), but may be ready by Sunday. Jason Marquis is "banged up" and is the fall-back option for Sunday.
The Reds have done noticeably better at home and since this series is being played at the Great American Ball Park they probably won't go down easy.