Tim Duncan -- I'm Done

Tim Duncan made it official ... he's retiring from the NBA after 19 seasons, all with the San Antonio Spurs.

40-year-old Duncan's leaving the game with a ton of hardware -- 5 NBA rings, a Rookie of the Year award and 2 MVP trophies.

The surefire future Hall of Famer will be replaced by Pau Gasol, who the Spurs signed last week.

Duncan was never the most thrilling player, but he consistently dominated enough to become the 14th highest scorer in NBA history.

One of the greatest moves of his career happened in defeat -- dragging his wasted teammate Aron Baynes out of a Hollywood nightclub. Solid effort, TD!