The start of the 2021-22 NBA league year not only meant the beginning of free agency but also extensions for former first-round picks entering the fourth and final season of their rookie contracts.
The 2018 draft has provided a particularly plentiful class of rookie extensions. After Luka Doncic, Trae Young and Shai Gilgeous-Alexander all signed max extensions earlier this summer, the Boston Celtics became the first team to sign a 2018 pick to a non-max extension, locking up center Robert Williams III.
Which extensions look likely to age best and which might be mistakes?