CREATE TABLE table_30606 ("Player" TEXT, "Matches" FLOAT, "Innings" FLOAT, "Runs" FLOAT, "Average" TEXT, "Highest Score" FLOAT, "100s" FLOAT, "50s" FLOAT)

What is the highest score in those games where the average is 9.88?
SELECT MIN("Highest Score") FROM table_30606 WHERE "Average" = '9.88'
SELECT MIN("Highest Score") FROM "table_30606" WHERE "Average" = '9.88'