49ers: Mack retires, leaving big hole in offensive line
49ers camp battles: Center, right guard boils down to Daniel
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49ers' Alex Mack announces retirement: 'I am so grateful to the
Alex Mack Retirement Creates Major Problem For 49ers
Center Alex Mack, who played for Browns, Falcons and 49ers
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49ers news: Alex Mack re-works his contract to free up $4 million
49ers restructure Alex Mack's contract, create $4 million in cap
NFL.com identifies 49ers' biggest roster hole heading into
What if Alex Mack retires? Should 49ers sign JC Tretter? Draft Cam
49ers C Alex Mack retires after 1 year in San Francisco
Talent With A Side Of Questions: Previewing The San Francisco
Veteran center and former Browns first-round pick Alex Mack retires