Is Cliff Lee a Volatile Pitcher?: BtB’s Bill Petti looks at monthly fluctuations in Cliff Lee’s ERA — are they especially big relative to other star pitchers?

The Year Of The (Phillies) Pitcher: At Cybermetrics, Cyril Morong writes about how rare it is for Philly to have 3 pitchers rank among the NL’s 5 best players by WAR.

Chasing a Halladay Changeup: At Baseball Analytics, David Pinto tells us that batters chase changeups from Roy Halladay more than any other hurler. Then, using heat maps, he shows us why Doc’s change is so baffling.

Roy Halladay – The Modern Day Sandy Koufax: Dave Cameron compares the two players… and it’s actually pretty close.

Keeping Score: Among Phillies’ Four Aces, a Surprising Big Two: Neil Paine at the NY Times: Roy Halladay is no surprise atop the Phils’ staff, but their 2nd most valuable pitcher is Hamels, not Lee.

Halladay Versus Beltre: David Pinto of Baseball Analytics with a detailed breakdown of Roy Halladay’s recent approach to Adrian Beltre.

Halladay and Left-Handed Batter Home Runs: From Baseball Analytics, David Pinto with a look at why left-handed hitters have 0 HR vs. Roy Halladay in 2011.

At FanGraphs, Dave Allen has a graphic demonstrating Halladay’s pinpoint control of the cut fastball. Link

David Pinto of Baseball Analytics has heat maps illustrating San Diego’s difficulty with Roy Halladay’s change. Link