On Wednesday, a day after re-signing injury-riddled Jimmie Ward, the 49ers added another defensive back with a lengthy medical file. The 49ers signed former Chargers cornerback Jason Verrett, a Fairfield native who has played in just five games over the past three seasons due to two surgeries on his left knee and a torn Achilles he sustained in training camp last year. The 49ers signed Verrett to a one-year, $3.6 million deal with $1 million guaranteed, ESPN reported. Verrett, a 2014 first-round pick, was a Pro Bowl alternate in 2015, the only season in his five-year career in which he's played more than six games. "I know I'm definitely a top corner in this league when I'm healthy," Verrett said. "I've just got to prove it. The 49ers are giving me an opportunity to do that." Verrett will compete for a starting spot at right outside cornerback opposite Richard Sherman. He will battle with Ahkello Witherspoon, a 2017 third-round pick, and Tarvarius Moore, a third-round selection last year. Verrett hopes to earn a spot in a starting lineup that could include Ward, who shares his pedigree - Ward was also a 2014 first-round selection - and injury woes. Ward has missed 29 games in a...