CREATE TABLE table_49143 ("Res." CLOB, "Record" CLOB, "Opponent" CLOB, "Method" CLOB, "Event" CLOB, "Round" FLOAT, "Time" CLOB, "Location" CLOB)

The tko (doctor stoppage) method was used in a loss against which opponent?
SELECT "Opponent" FROM table_49143 WHERE "Method" = 'tko (doctor stoppage)' AND "Res." = 'loss'
SELECT "Opponent" FROM "table_49143" WHERE "Method" = 'tko (doctor stoppage)' AND "Res." = 'loss'