CREATE TABLE table_21689 ("Athlete" TEXT, "Event" TEXT, "Round of 32" TEXT, "Round of 16" TEXT, "Quarterfinals" TEXT, "Semifinals" TEXT)

Who did Abdelhafid Benchebla face in the quarterfinals?
SELECT "Quarterfinals" FROM table_21689 WHERE "Athlete" = 'Abdelhafid Benchebla'
SELECT "Quarterfinals" FROM "table_21689" WHERE "Athlete" = 'Abdelhafid Benchebla'