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

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'