Small sample size (I believe Volquez has two career starts vs the Phillies), but Rollins, Howard, Utley, and Victorino are a combined 3-for-25 in their careers off EV. The Reds are 1-1 against Halladay this year, and Halladay did not even get the decision in the one the Reds lost. This group appears to have finally "solved" Oswalt, too.
Reds took 2 of 3 from the Phils in June, then had the 4 game sweep in July, which saw three of the four go extras, a pair of 1-0 games, and the Reds blow a 6 run lead in the 9th. I don't know how much weight to put into the July sweep since both teams were shorthanded (the Phils were without Utley and Polanco, the Reds were without Hernandez and Rolen, plus Bruce and Gomes were in terrible slides).
The Phillies are the best team in the NL, but they are not invincible. If the Reds can scratch out some runs and get 5 good innings from the starters, Rhodes, Chapman, Bray and Wood in the pen is a ridiculous amount of lefty arms to throw at the Phillies in the late innings.