Alex Mack retiring: Pro Bowl center ending career after 13 seasons with Browns, Falcons and 49ers, per report | CBS Sports Headlines Alex Mack retiring: Pro Bowl center ending career after 13 seasons with Browns, Falcons and 49ers, per report Mack is going out at the peak of his powers … Continue reading Alex Mack retiring: Pro Bowl center ending career after 13 seasons with Browns, Falcons and 49ers, per report