CREATE TABLE table_56621 ("Edition" CLOB, "Round" CLOB, "Date" CLOB, "Partner" CLOB, "Surface" CLOB, "Opponents" CLOB, "Result" CLOB)

Who was Manuela Maleeva opponent when she played a match partnered with michelle strebel?
SELECT "Opponents" FROM table_56621 WHERE "Partner" = 'michelle strebel'
SELECT "Opponents" FROM "table_56621" WHERE "Partner" = 'michelle strebel'