Frank Gore signs 1-day contract Thursday to retire with 49ers; center Alex Mack announces retirement Friday, Ap
Veteran center and former Browns first-round pick Alex Mack retires
Alex Mack, Pro Bowl center, retires after 13 NFL seasons
Alex Mack retires: Seven-time Pro Bowl center ends career after 13 seasons with Browns, Falcons and 49ers
Center Alex Mack, who played for Browns, Falcons and 49ers, retires after 13 NFL seasons: Reports - The Athletic
Former Cleveland Browns C Alex Mack announces retirement from NFL
Silver]Seven-time Pro Bowl center Alex Mack is retiring after 13 seasons. The former Browns, Falcons and 49ers standout was one of the top linemen of his era. @BallySports @49ers : r/nfl
49ers' Alex Mack announces retirement: 'I am so grateful to the game of football'
49ers' Alex Mack ends NFL career after 13 seasons