Seven-time Pro-Bowl center Alex Mack officially announced his retirement after 13 seasons in the NFL.
49ers Center Alex Mack Reveals why he is Retiring - Sports Illustrated San Francisco 49ers News, Analysis and More
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Khalil Mack: “Charles Woodson told me a long time ago — he was like, 'You cannot waste time. This shit is very valuable.' I understand that now, going into Year 8. And
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Alex Mack announces NFL retirement