Even when the Celtics called to try setting up a second workout, Tatum said he told his agent, Jeff Wechsler, he liked it in Phoenix and did not want to go to Boston. The weather in Phoenix was nice. Tatum thought he could buy a big house with a pool and his mother would be all right there. His agent tried to sell him on the Celtics’ merits, but Tatum wasn’t budging. “We hang up,” Tatum said. “I’m like, ‘I’m not going to this workout. I’m cool.’”