The Brief The Dallas Mavericks won the NBA Draft Lottery on Monday night. Video shows GM Nico Harrison celebrating the win with other front office executives. The Dallas Mavericks have the first overall pick in the draft and general manager Nico Harrison is pretty excited about it. Featured articleIn a video posted to the Dallas Mavericks social media account, Harrison is seen jumping for joy after it is announced that the Mavericks won the NBA Draft Lottery. Nico Harrison reacts to winning NBA Draft LotteryWhat Happened:The video shows several Dallas Mavericks executives sitting at a table watching the lottery.