GREEN BAY, Wis. -- Here's how far Trevor Davis went to show the Green Bay Packers he wants to be their punt returner:

"Trevor sent me tapes during the summer, or during the break here, of him catching punts, which really impressed me," Packers special-teams coordinator Ron Zook said. "He worked on it, and he's the first guy in the National Football League that's ever sent me video of him catching the ball. So he's worked on it, he knows it's important and he's come a long, long, long way. I feel very, very confident with him catching punts, catching anything, really."

Davis held the job for a portion of his rookie season. In fact, his average of 12.8 yards per return was more than twice what primary returner Micah Hyde averaged. But Davis did not take a single turn after he fumbled a punt in the Week 10 game against the Tennessee Titans.

The 2016 fifth-round pick from Cal played in 13 of a possible 19 games, including playoffs, last season but made a minimal impact as a receiver. He caught all three of his passes for 24 yards and a touchdown in the same game -- on Oct. 30 at Atlanta.

So far in training camp, Davis has taken reps as either the No. 1 or No. 2 return man on both punts and kickoffs. If coach Mike McCarthy decides to use starting receiver Randall Cobb on punt returns -- something he has done extensively this camp -- then Davis probably would be the backup.

Davis' speed -- he might be the fastest player on the Packers' roster -- makes him an intriguing option on offense and special teams. But ball security remains foremost on the Packers' mind when it comes to fielding kicks, and Davis had another hiccup last week when he muffed one of Justin Vogel's best punts. But that did not turn off Zook.

"I think he's dropped one punt," Zook said. "You saw him go back there, and really he ran back there and Justin hit 'em. He did. He hit a bomb. It was like a 5.03 or a 5.07 hang time and it fell in on him."

Davis will no doubt get more chances the rest of the month, beginning with Saturday's Family Night practice at Lambeau Field. The annual event typically features several special-teams periods to put the specialists through game-like pressure under the lights in the stadium. Davis also has been impressive so far as a receiver during camp.

As for the film Davis sent Zook, he told his coach before he left for the summer that he would send him clips, but Davis said: "He didn't think I'd do it."

Davis said the clips were shot at San Jose State, where he worked out with a former college punter.

"I've been doing that all summer," Davis said. "I told him before I left, I was going to do it. I decided to send it to him because he didn't think I was going to."

And he wanted Zook to know just how much he wants the job.

"That definitely was my intention," Davis said.