CREATE TABLE table_8779 ("Tournament" CLOB, "1987" CLOB, "1988" CLOB, "1989" CLOB, "1990" CLOB, "1991" CLOB, "1992" CLOB, "1993" CLOB, "1994" CLOB, "Career SR" CLOB)

With a 1992 result of A, and at the U.S. Open Tournament, what is the 1989 result?
SELECT "1989" FROM table_8779 WHERE "1992" = 'a' AND "Tournament" = 'u.s. open'
SELECT "1989" FROM "table_8779" WHERE "1992" = 'a' AND "Tournament" = 'u.s. open'