Question: What was the round in 1968?
SQL: SELECT "Round" FROM "2-18336099-1" WHERE "Year" = 1968.0;

Question: What is the round for a year earlier than 1987?
SQL: SELECT "Round" FROM "2-18336099-1" WHERE "Year" < 1987.0;

Question: What is the round when Grand Slam was the Davis Cup?
SQL: SELECT "Round" FROM "2-18336099-1" WHERE "Grand Slam" = 'Davis Cup';

Question: What is the grand slam in 1987, when round shows First round, and Ivan Lendl won?
SQL: SELECT "Grand Slam" FROM "2-18336099-1" WHERE "Year" = 1987.0 AND "Round" = 'First round' AND "Winner" = 'Ivan Lendl';