Since he first arrived at the Under Armour Performance Center for Baltimore Ravens rookie minicamp on a tryout basis and not even as a part of the team’s undrafted rookie class, cornerback Keyon Martin wasn’t guaranteed anything and had to earn everything. The former University of Louisiana-Lafayette standout made a good enough impression in minicamp to get signed to the 90-man roster. Following a strong training camp that saw him emerge as one of the brightest stars of the preseason, Martin has put himself in a tremendous position to make the 53-man roster. “He keeps making big plays, and that’s something that is accounted for, for sure,” Head Coach John Harbaugh said.