FILE – In this Aug. 16, 2019, file photo, United States’ Kemba Walker is shown during the second half of an exhibition basketball game against Spain in Anaheim, Calif. The Boston Celtics will have at least three and possibly four players on the final 12-man roster that USA Basketball will take to China next week for the FIBA World Cup. So these Team USA practices have been a get-to-know-you bonus of sorts for new Celtics guard Kemba Walker and Boston teammates Jayson Tatum, Jaylen Brown and Marcus Smart. (AP Photo/Marcio Jose Sanchez, File)