Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_35 ( grand_slam VARCHAR, winner VARCHAR, year VARCHAR, round VARCHAR )

### Question ###
What is the grand slam in 1987, when round shows first round, and Ivan Lendl won?

### Accurate SQL ###

SELECT grand_slam FROM table_name_35 WHERE year = 1987 AND round = "first round" AND winner = "ivan lendl"