The South Carolina Gamecocks upset the Duke Blue Devils 88-81 Sunday night to advance to the Sweet 16 in the NCAA men’s basketball tournament. Duke, the No. 2 seed in the East Region, entered the season ranked No. 1, and after injuries and other setbacks headed into the tournament a title contender after winning the Atlantic Coast Conference tournament. Duke finished the first half of Sunday’s game with a lead, as expected, over the No. 7 seeded Gamecocks, but could not keep up in the second half as South Carolina shot 71 percent from the field. North Carolina, another ACC powerhouse and the South Region No. 1 seed, narrowly escaped a similar fate on the tournament’s fourth day, blowing a 17-point lead before scoring the game’s final 12 points to beat Arkansas and advance. In the women’s tournament, No. 1-seeded Notre Dame held off No. 9 seed Purdue, 88-82, to reach the round of 16.