TULSA, Okla. — Garrett Covington scored 20 points, Jeremiah Usiosefe scored 10 and the game-winning free throws, and Western Illinois held off Oral Roberts 63-60 on Wednesday night to end a two-game skid. Covington’s jumper capped a 13-2 second-half run and the Leathernecks pulled ahead 44-32, then led by 13, 60-47, on his 3-pointer with