The Gamecocks (12-7, 2-4 SEC) trailed by 12 less than five minutes into the game, but turned things around with a 40-11 run the rest of the period. Richardson was a big reason, scoring 11 points off three 3-pointers to push South Carolina to its first SEC victory of 20-points or more in seven seasons.
Arkansas (12-7, 3-3) could never get closer than 14 points in the second half as it lost its third straight league game on the road this season. Marshawn Powell had 22 points and 13 rebounds for the Razorbacks, who had come in off a 26-point victory at home Wednesday night over Mississippi State.
Bruce Ellington added 14 points on 6-of-8 shooting for South Carolina.