The Phillies and Astros are closing in on a trade involving All-Star outfielder Hunter Pence, according to sources. In exchange for Pence, Houston will receive four prospects. Officials from both clubs said that the trade should be finalized by Friday night. The "headline pieces," in this case, would appear to be the Phillies top pitching prospect, Jarred Cosart, and their top hitting prospect, Jonathan Singleton. Philadelphia's package does not include either outfielder Domonic Brown or rookie starter Vance Worley, sources said. Houston is expected to receive two players to be named later in the deal.