CREATE TABLE table_60355 ("Tournament" TEXT, "1988" TEXT, "1990" TEXT, "1991" TEXT, "1992" TEXT, "1993" TEXT, "1995" TEXT, "1996" TEXT, "1997" TEXT, "1998" TEXT, "1999" TEXT, "2000" TEXT, "2001" TEXT, "Career SR" TEXT, "Career Win-Loss" TEXT)

What was the 1999 Tournament at the US Open?
SELECT "1999" FROM table_60355 WHERE "Tournament" = 'us open'
SELECT "1999" FROM "table_60355" WHERE "Tournament" = 'us open'