Detroit Lions

The Lions gave Darius Slay a four-year extension worth more than $50 million to make him one of the NFL’s highest-paid cornerbacks. Nevin Lawson and Quandre Diggs lack the experience and contract of Slay, but Detroit also is excited about the ascent of its young No. 2 and No. 3 cornerbacks. “Highly competitive guy and not only that, I think towards the end of the year last year he made a lot of big plays for us,” coach Jim

Caldwell said of Lawson, who held down the right corner spot opposite Slay for the final eight games in 2015 and tallied seven passes defensed.

Diggs’ aggressiveness and toughness continue to stand out. “He’s been a good player for us, for a young guy,” Caldwell said.

Rookie watch: How quickly can third-round C Graham Glasgow usurp 14-game 2015 starter

Travis Swanson? Glasgow opened camp with the second team. First-round LT Eric Decker has started ahead of Riley

Reiff, now at right tackle, since May. Decker’s play will be critical to improving a disappointing line that allowed QB Matthew Staf

ford to absorb 89 combined sacks from 2014 to 2015.

Noteworthy: The Lions, “a little prudent” after DeAndre

Levy missed nearly all of last season with a hip injury, open camp with their best linebacker on the active/non-football injury list. … Two days after signing a one-year deal worth up to $2.75 million, WR Anquan Bol

din, who’s No. 5 on the NFL’s active receiving list, opened camp as a starter.