OXNARD, Calif. -- First-round pick Zack Martin had a welcome-to-the-NFL moment on the first full-speed practice rep of his NFL career.

Defensive tackle Henry Melton exploded past the rookie right guard in the one-on-one pass-rush drill. In the blink of an eye, Melton got Martin to lean a little to his right, changed directions and ripped through with his hands to win the rep about as convincingly as possible.

"I just had to let him know that I'm here and it's going to be a long training camp," Melton said.

Martin has made it clear that he's ready for it. That first rep is the only time Martin has looked like a rookie during his first two days wearing pads with the Dallas Cowboys.

The Cowboys were confident that Martin, who set the Notre Dame record for games started with 52, could make an immediate impact when they drafted him with the 16th overall pick. He has done nothing to dispel that notion during his first couple of full-contact practices.

"I know there's a lot of expectations," Martin said. "Like I said in the past, I'm just trying to be consistent and show these guys that I can show up every day."

A couple of defensive assistant coaches offered high praise for Martin, saying he carries himself like a veteran on the practice field. He's held his own against Melton, a 2012 Pro Bowler, and has often dominated other defensive tackles.

"He's good," Melton said. "I purposely line myself up with him. He's coming on strong. If I'm working with him, he's making me better and I'm making him better. There's no one else better to work with."