CREATE TABLE table_56076 ("Round" FLOAT, "Overall" TEXT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "Club team" TEXT)

What is the average round of a player with an overall of 138?
SELECT AVG("Round") FROM table_56076 WHERE "Overall" = '138'
SELECT AVG("Round") FROM "table_56076" WHERE "Overall" = '138'