In sports, there were some things we thought were guarantees. No more.

It had never happened in the NCAA Basketball Tournament: a No. 1 seed losing to a No. 16. That all changed on March 16, 2018, when the UMBC Retrievers beat the Virginia Cavaliers by 20 points, 74-54, becoming the ultimate Cinderella team. (Streeter Lecka / Getty Images)