CREATE TABLE table_51818 ("Tournament" TEXT, "1968" TEXT, "1969" TEXT, "1970" TEXT, "1971" TEXT, "1972" TEXT, "1973" TEXT, "1974" TEXT, "1975" TEXT, "1976" TEXT, "1977" TEXT, "1978" TEXT, "1979" TEXT, "Career SR" TEXT, "Career W\\u2013L" TEXT, "Career Win %" TEXT)

What is the listing for the US Open in 1977?
SELECT "1977" FROM table_51818 WHERE "Tournament" = 'us open'
SELECT "1977" FROM "table_51818" WHERE "Tournament" = 'us open'