Cooper Flagg lived up to every expectation during one season at Duke and has the potential for NBA superstardom. The Mavericks are expected to take Flagg with the No. 1 pick in the draft on Wednesday night, quickly adding another franchise-altering player after trading one away last season. The Mavericks fell into the lottery after dealing Luka Doncic to the Los Angeles Lakers in February, though they had only a 1.8% chance of winning it.