CREATE TABLE table_63996 ("Round" TEXT, "Date" TEXT, "Matches" FLOAT, "Clubs" TEXT, "New entries this round" TEXT, "Prize money" TEXT)

What is the highest number of matches that has a round of Third Round?
SELECT MAX("Matches") FROM table_63996 WHERE "Round" = 'third round'
SELECT MAX("Matches") FROM "table_63996" WHERE "Round" = 'third round'