CREATE TABLE table_53824 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What was the Winning score for the Mynavi ABC Championship Tournament?
SELECT "Winning score" FROM table_53824 WHERE "Tournament" = 'mynavi abc championship'
SELECT "Winning score" FROM "table_53824" WHERE "Tournament" = 'mynavi abc championship'