CREATE TABLE table_72173 ("Round" FLOAT, "Grand Prix" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

Who had the fastest lap in the Belgian Grand Prix?
SELECT "Fastest Lap" FROM table_72173 WHERE "Grand Prix" = 'Belgian Grand Prix'
SELECT "Fastest Lap" FROM "table_72173" WHERE "Grand Prix" = 'Belgian Grand Prix'