CREATE TABLE table_20622 ("Missouri vs." TEXT, "Overall Record" TEXT, "at Columbia" TEXT, "at Opponents Venue" TEXT, "at Neutral Site" TEXT, "Last 5 Meetings" TEXT, "Last 10 Meetings" TEXT, "Current Streak" TEXT, "Since Joining SEC" TEXT)

Who are the opponents of Missouri that have an overall record of MU, 3-1?
SELECT "Missouri vs." FROM table_20622 WHERE "Overall Record" = 'MU, 3-1'
SELECT "Missouri vs." FROM "table_20622" WHERE "Overall Record" = 'MU, 3-1'