CREATE TABLE table_50098 ("Player" TEXT, "Nationality" TEXT, "Position" TEXT, "Years for Grizzlies" TEXT, "School/Club Team" TEXT)

What is the nationality of Duke?
SELECT "Nationality" FROM table_50098 WHERE "School/Club Team" = 'duke'
SELECT "Nationality" FROM "table_50098" WHERE "School/Club Team" = 'duke'