The Man Who Couldn't Let Go, Part 1

From humble hustler to billionaire maverick, Mark Cuban bought the Dallas Mavericks and transformed them from laughingstock to contender, only to suffer one of the most painful Finals losses in NBA history.

Part 1 of a 3-part series from 'The Build' traces Cuban's rise, his relentless bet on Dallas, and the heartbreak that set the stage for an unforgettable championship run.