CREATE TABLE table_48090 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

Which Opponent has a Time of 4:51?
SELECT "Opponent" FROM table_48090 WHERE "Time" = '4:51'
SELECT "Opponent" FROM "table_48090" WHERE "Time" = '4:51'