From Mr. Irrelevant to Mr. Clutch: 5'9" Isaiah Thomas' Unlikely Rise in NBA

Isaiah Thomas is the third-highest scorer in the NBA this season, averaging 28.9 points and 5.9 assists per game.

He has elevated the Boston Celtics to the No. 1 seed in the East and a chance at an NBA championship.

But his road to stardom wasn't easy. Watch the video above to hear more.