49ers C Alex Mack Retiring After 13 Seasons
7-time Pro Bowl C Alex Mack retires after 13 years in NFL Ohio & Great Lakes News - Bally Sports
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Alex Mack - NFL Center - News, Stats, Bio and more - The Athletic
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49ers C Alex Mack Mulling Retirement
San Francisco 49ers center Alex Mack retiring after 13 NFL seasons
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