NBA Finals: Celtics take nothing for granted on brink of crown

Jayson Tatum has known since he was drafted by the Celtics in 2017 that the measure of success in Boston is an NBA title, but he’s not chalking up championship No. 18 just yet. “Even now, up 3-0, nobody is celebrating or anything,” Tatum said Thursday, a day after the Celtics thwarted a late Dallas