"He's really come on as far as our knowledge of the defense," said Martinez, who also is Georgia's secondary coach. "In the last couple of days, he's really come on for whatever reason. He's just stepped it up to another gear. I'm excited."
The only problem for Miller is he's still wearing a cast on his wrist due to a hairline fracture he suffered last fall. Team doctors had to perform surgery on the wrist this offseason, necessitating the cast this spring.
"The thing that is discouraging is he can't use his hand with that cast. He shows a lot of toughness, goes out there every day, but that's hampered him," Martinez said.
Miller, who had 10 tackles last year while working mostly on special teams, is expected to have the cast off in time for fall practice.
Starting wide corner Bryan Evans has been impressed with Miller, he said, and is preparing for a battle for his position.
"I think the competition at wide corner has been very intense with both of us knowing we have a chance to start, but right now we pretty much know that either way it goes, the second wide corner is going to have to play," Evans said.