On this day in sports: December 21
- 1992 Born: Ha Ha Clinton-Dix, American football player Source
- 1997 Born: Charlie McAvoy, American ice hockey player Source
- 2006 Born: Cooper Flagg, American basketball player Source
From Wikipedia's "On this day" feed via the Wikimedia API (CC BY-SA). The text is Wikipedia's, filtered to sports items. Nothing was added.