The win was the second straight for the Razorbacks, who survived the hot-shooting Tigers and guard Frankie Sullivan's five second-half 3-pointers.
Young added 22 points and Mardracus Wade had 12 for Arkansas (11-5, 2-1 Southeastern), which now has won seven of its last eight games. Powell had 21 points in the second half and overtimes, finishing with his second-highest point total of the season.
Sullivan led Auburn (8-8, 2-1) with 26 points, 23 of them after halftime. He was 5 of 11 on 3-pointers, and the Tigers were 11 of 25 overall from behind the arc.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.