With the 45th overall pick in the 2019 NBA Draft, the Dallas Mavericks selected Isaiah Roby out of the University of Nebraska. Roby played three years for the Cornhuskers, getting steadily better each year. He decided to forego his senior year in order to enter the NBA Draft and the Mavs were interested in him right from the start.
Dallas recognized the talent that was there with Roby, but also recognized that they could get him later in the draft than they originally thought. For that reason, Dallas traded back in the draft to get the guy they wanted, along with a couple other assets.