EVANSTON—D.J. Richardson scored 18 points to lead Illinois to a 62-41 victory over Northwestern on Sunday night.Tracy Abrams added 13 points off the bench for the Illini (19-8, 6-7 Big Ten), who have won four straight.Reggie Hearn led NU with 11 points. The Wildcats (13-13, 4-9) have lost three straight and five of their last six.Illinois scored the first 16 points of the second half after ending the first half on a 10-0 run.That run became 26-0 into the second half. Richardson’s layup extended Illinois’ lead to 45-15 with 13:53 remaining. James Montgomery scored Northwestern’s first points of the half on a layup with 13:26 left.Northwestern shot 25 percent from the field and Illinois shot 43.6 percent.Illinois avenged a 68-54 home loss to Northwestern on Jan. 17.During their winning streak, the Illini have also beaten top-ranked Indiana, then-No. 18 Minnesota and Purdue.