CREATE TABLE table_22498 ("Athlete" TEXT, "Class" TEXT, "Event" TEXT, "Round of 32" TEXT, "Round of 16" TEXT, "Quarterfinals" TEXT, "Semifinals" TEXT, "Final/ Bronze medal match" TEXT)

What is the round of 16 result for Jiske Griffioen Esther Vergeer?
SELECT "Round of 16" FROM table_22498 WHERE "Athlete" = 'Jiske Griffioen Esther Vergeer'
SELECT "Round of 16" FROM "table_22498" WHERE "Athlete" = 'Jiske Griffioen Esther Vergeer'