CREATE TABLE table_4725 ("Rank" FLOAT, "Player" TEXT, "County" TEXT, "Tally" TEXT, "Total" FLOAT, "Opposition" TEXT)

What is Tony O'Sullivan's county?
SELECT "County" FROM table_4725 WHERE "Player" = 'tony o''sullivan'
SELECT "County" FROM "table_4725" WHERE "Player" = 'tony o\'sullivan'