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

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'