CREATE TABLE table_3921 ("Outcome" TEXT, "Edition" TEXT, "Opponent Team" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

In what edition was the opponent team Zimbabwe?
SELECT "Edition" FROM table_3921 WHERE "Opponent Team" = 'Zimbabwe'
SELECT "Edition" FROM "table_3921" WHERE "Opponent Team" = 'Zimbabwe'