Barry Zito formally announced his retirement Monday.

Zito formally announced his retirement Monday.

Analysis:

This season had long been expected to be Zito's last, but the 37-year-old only made it official Monday. The lefty made just three appearances in the majors this season after taking 2014 off, but will end his career with 165 wins for the A's and Giants, three All-Star selections, and a Cy Young award.