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Breaking down the latest NBA rookie contract extensions on deadline day

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. And plenty more deals are getting reported ahead of today's 6 p.