Carmelo Anthony -- one of the greatest offensive talents in NBA history -- is retiring from professional basketball ... and while he's excited about his future, he's calling the decision a "bittersweet goodbye."
The 10x All-Star shared the news in an Instagram video on Monday ... as he reflected on his basketball career by showing highlights of him playing in high school, college and the pros.
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Of course, Anthony played his high school ball at Oak Hill Academy in Virginia, then starred for Syracuse University, where he won an NCAA title in 2003.
The Nuggets selected Melo with the third overall pick in the '03 draft, which featured LeBron James, Dwyane Wadeand Chris Bosh, arguably one of the deepest draft classes ever.