Sign up today for the new CNBC Sport Newsletter MACAO — The National Basketball Association returns to China for the first of two Macao games on Friday, and the impact extends beyond the preseason. The weekend marks a major milestone for the NBA, as years of rebuilding its relationship with its second-largest market culminate with the Phoenix Suns and Brooklyn Nets facing off in the Venetian Arena here. For the NBA, it could mean unlocking future growth in China as television viewership