Luka Doncic scored 50 points, hitting the 10,000-point plateau as he propelled the Dallas Mavericks to a 128-114 victory over Phoenix on Monday as Boston downed the Lakers in a Christmas clash of storied NBA rivals.He made all 12 of his free throws as he became the fourth player to score 50 or more points on Christmas, which the NBA traditionally celebrates with a slate of marquee games.