Answered November 20th, 2017

Kyrie Irving had an EFG% of 84.1 on Monday, the highest in a game with 45+ points for Boston since 1983-84.

Which Celtics player has the highest eFG% in a game with at least 45 points?
Interpreted as:
Which Celtics player has the highest eFG% in a regular season game with at least 45 points?