CREATE TABLE table_1517 ("Edition" CLOB, "Round" CLOB, "Date" CLOB, "Partnering" CLOB, "Against" CLOB, "Surface" CLOB, "Opponents" CLOB, "W/L" CLOB, "Result" CLOB)

Who are all the opponents of Slovakia?
SELECT "Opponents" FROM table_1517 WHERE "Against" = 'Slovakia'
SELECT "Opponents" FROM "table_1517" WHERE "Against" = 'Slovakia'