CREATE TABLE table_41953 ("Tournament" TEXT, "1993" TEXT, "1994" TEXT, "1995" TEXT, "1996" TEXT, "1997" TEXT, "1998" TEXT, "1999" TEXT, "2000" TEXT, "2001" TEXT, "2002" TEXT, "2003" TEXT, "2004" TEXT, "2005" TEXT, "2006" TEXT, "2007" TEXT, "2008" TEXT, "2009" TEXT)

What is 1998, when 1994 is Grand Slam Tournaments?
SELECT "1998" FROM table_41953 WHERE "1994" = 'grand slam tournaments'
SELECT "1998" FROM "table_41953" WHERE "1994" = 'grand slam tournaments'