papichusetts welcomes youSports Illustrated cover boy says:
"When I first saw [Papelbon], I thought he would be something special. I thought he was a young Roger Clemens. The confidence. The velocity. The attitude. It was like a carbon copy of Roger Clemens. I'm pretty sure you guys [i.e. the media] felt the same way. You don't see many like him, a guy who comes into the game and acts like he's been around 10 years. You don't see players like that. When you do, you've got a superstar."
Brilliant! From here
And, apparently it's a mutual admiration society, because Papelbon had this to say about Papi:
"It's almost expected of him now, which is kind of tough on him because when he doesn't do it, it's kind of a downfall to him," Papelbon said. "He's clutch, man. He's money."
From here which is definitely recommended reading as it has many delightful bits about both Papelbon and Papi.