CREATE TABLE table_5580 ("Result" TEXT, "Record" TEXT, "Opponent" TEXT, "Event" TEXT, "Method" TEXT, "Round" TEXT, "Time" TEXT)

Which opponent led to a 6-3 record?
SELECT "Opponent" FROM table_5580 WHERE "Record" = '6-3'
SELECT "Opponent" FROM "table_5580" WHERE "Record" = '6-3'