This article was originally published on www.si.com/nba/mavericks as Cooper Flagg named Summer League winner for Mavericks. Dallas Mavericks rookie Cooper Flagg only needed two appearances in the Las Vegas Summer League to prove that he is legit.

At Duke, he averaged 19.2 points, 7.5 rebounds, and 4.2 assists per game, earning a litany of awards, including ACC Player of the Year and Freshman of the Year honors while leading the Blue Devils to the Final Four. Nationally, he won the Wooden and Naismith Awards for Player of the Year, and he was also a consensus All-American.

Mavericks rookie forward Cooper Flagg has been given a surprising Summer League performance grade by an expert.