The Celtics put Boston in the NBA spotlight on Thursday with a gritty 121-118 overtime win over reigning champions Golden State as the league polished its global credentials with a glitzy game in Paris.Jayson Tatum and Jaylen Brown came alive late for the Celtics, whose eighth straight win -- this one against the team that bested them in last season's NBA Finals -- pushed their league-leading record to 34-12.