CREATE TABLE table_74325 ("Player" TEXT, "Matches" FLOAT, "Innings" FLOAT, "Runs" FLOAT, "Average" TEXT, "Strike rate" TEXT, "Highest Score" TEXT, "50s" FLOAT)

What is the highest score for the player with average of 30.00?
SELECT "Highest Score" FROM table_74325 WHERE "Average" = '30.00'
SELECT "Highest Score" FROM "table_74325" WHERE "Average" = '30.00'