After each promising start, Tyler Cloyd and Jonathan Pettibone stand in front of their locker and answer the same questions about their future. Do they think about how their time here could come to an end quickly? Does that affect at all how they pitch?

Each time, they reply with the same answer. They’re just here to do their job. To keep the team in the game. And that is exactly what they’ve done.

Outside of Domonic Brown and his manic home-run pace, the Phillies’ rotation might be its most valuable asset in 2013. They’ve endured injuries. Seven men have started games for the team this year, and yet they still have a collective 3.96 ERA.

“They’ve been good,” Phillies manager Charlie Manuel said.

Kyle Kendrick and Cliff Lee have obviously been on the front line of that success. Lee is having a typical Lee year, while Kendrick is turning into one of the most reliable pitchers in all of baseball.

Cloyd and Pettibone, however, might be more valuable.

Outside of Cloyd’s debacle in Boston last week, both have been excellent.

Pettibone, who pitches today, is 3-1 with a solid 3.40 ERA. Cloyd is 2-2 with a 3.68 ERA. Both began the year in Triple-A.

Injuries to Roy Halladay and John Lannan paved the way for Cloyd’s second stint in the bigs and Pettibone’s debut. Cloyd, who pitches in Halladay’s No. 2 slot in the rotation, said it’s hard to fathom replacing Halladay.

“I don’t think you can fill in for Roy, a pitcher of that status and how great he is,” Cloyd said. “For me it’s just going out there and competing and giving the team a chance to win every time. And that’s been my main goal ever since I got up here. That’s all I concentrate on.”

Pettibone, 22, slid into the fourth spot in the rotation that Lannan held before going on the disabled list April 18. He has been spectacularly solid. He doesn’t have top-of-the-rotation stuff, yet hasn’t been beat up through nine starts.