SELECT "Round of 32" FROM table_21690 WHERE "Athlete" = 'Nabil Kassel'
Who did Nabil Kassel face in the Round of 32?
CREATE TABLE table_21690 (
    "Athlete" text,
    "Event" text,
    "Round of 32" text,
    "Round of 16" text,
    "Quarterfinals" text,
    "Semifinals" text
)