DALLAS (AP) — The Dallas Mavericks traded down in the second round of the NBA draft, ending up with Nebraska forward Isaiah Roby at No. 45 overall. Dallas initially selected Deividas Sirvydis of Lithuania at No. 37, but agreed to trade his rights to the Detroit Pistons for Roby and two future second-round picks. Dallas, which traded its first round pick to Atlanta as a result of last year’s draft-day trade for Luka Doncic, now brings in Roby, who averaged 12 points and seven rebounds for the Cornhuskers. Roby graduated Dixon High School in 2016.