Per family friend and longtime NBA sniper Jason Terry, Tatum is now ready to handle it all. “I think for him, right now, he believes it,” Terry said before leaving Barclays Center. “That self-belief is what you’re starting to see out here. He really believes he’s top five in the league. And he’s shown it.” Against one of the best players of this generation, Tatum owned the series on both ends of the court. He won Game 1 with a buzzer-beating layup. He led the Celtics back from 17 points down in Game 2, then controlled possession after possession in Games 3 and 4. He averaged 29.5 points, 7.3 assists and 4.5 rebounds per game while holding Durant well below his usual production and efficiency. Tatum even blocked two Durant jump shots, which nobody does, and missed a third by about an inch.