Answered March 20th, 2019

Jonas Valanciunas is the first Grizzlies player with at least 30 points and 15 rebounds in a game since Zach Randolph in 2012.

Who was the last Grizzlies player with 30 points and 15 rebounds in a game?
Interpreted as:
Who was the last Grizzlies player with 30 or more points and 15 or more rebounds in a game?