CREATE TABLE table_204_520 (id NUMBER, "outcome" CLOB, "no." NUMBER, "date" NUMBER, "championship" CLOB, "surface" CLOB, "opponent" CLOB, "score" CLOB)

which opponent is listed previous to j rgen fassbender ?
SELECT "opponent" FROM table_204_520 WHERE id = (SELECT id FROM table_204_520 WHERE "opponent" = 'jurgen fassbender') - 1
SELECT "opponent" FROM "table_204_520" WHERE "id" = (SELECT "id" FROM "table_204_520" WHERE "opponent" = 'jurgen fassbender') - 1