The biggest impact of any injury to Ethan Martin -- the power righty left yesterday's game with diminished velocity and shoulder soreness and is scheduled to see a doctor -- would likely fall on the Phillies' bullpen instead of their rotation.
Let's not forget why Martin ended up in the bullpen last year. Sure, he'd look good for a few innings, then get clobbered. But it wasn't an endurance issue. Rather, he did not have the command of his secondary stuff necessary to keep hitters off balance during his second, third, etc. times through the order. Of the 143 sliders he threw last year, 45 percent were called as balls. Same goes for his change up (49 percent called for balls) and curveball (59 percent called for balls). His fastball was called a ball 36 percent of the time. Martin is 25 years old and has five years of professional baseball under his belt. There's a pretty good chance he was going to end up in the bullpen, where he made seven appearances last season, allowing three runs and four walks with 11 strikeouts in seven innings.
As a reliever, Martin held opposing batters to a .185/.290/.333 line, which is similar to his line as a starter against batters the first time through the order (.222/.296/.333). Once hitters calibrated themselves to his fastball, they feasted, to the tune of .306/.404/.551 their second time against him, and .364/.533/.955 their third time against him. Those are HS softball numbers. But the important thing was his success in his first time facing them. That, to me, along with the blistering nature of his fastball, was an indication that he had a decent chance to be a very good sixth and/or seventh inning reliever in front of Jonathan Papelbon and Antonio Bastardo.
Of the 70 starts Kyle Kendrick has made over the last three seasons, 27 have lasted fewer than six innings, and 13 have lasted fewer than five. Of the 59 starts that Roberto Hernandez has made over the last three seasons, 20 have lasted fewer than six innings, and 11 have lasted fewer than five. Those are your No. 4 and No. 5 starters at this point.