1st, Sanchez has pitched like a #1 this season. Just have to hope he keeps it up.
2nd, Hamels, Blanton, Meyers, Moyer, and Kendrick won the Phils a WS in 2008. Phillies pitching overall ranked 6th in ERA that year and 15th in FIP (more telling than ERA).
And since everyone likes to b!tch about how bad the current Phil line up is, the 2008 team was 9th in runs scored, 16th in OBP and 6th in slugging. Not a whole lot different than now.
Like I keep saying, winning a WS is all about getting in the playoffs and getting hot at the right time. Oddsmakers currently have the Phillies with about third best chance to win it all (DK actually shows 2nd), with an implied probability of about 11-13%. Dodgers are 1st at ~25%.