NEW YORK, NEW YORK - JUNE 01: Marcus Smart #36 of the Boston Celtics reacts against the Brooklyn Nets in Game Five of the First Round of the 2021 NBA Playoffs at Barclays Center on June 01, 2021 in the Brooklyn borough of New York City. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Steven Ryan/Getty Images)
One of the most significant moves made by the Boston Celtics this offseason was trading Kemba Walker to the Oklahoma City Thunder in exchange for Al Horford.