Answered January 31st, 2018

CJ McCollum is the second player in the last 30 seasons to score 50 points in less than 30 minutes.

The other was Klay Thompson when he scored 60 points in 3 quarters.

Who was the last player to score 50 points in less than 30 minutes in a game
Interpreted as:
Who was the last player to score 50 points in less than 30 minutes in a regular season game?