Table: tennis_grand_slams_2
Columns: year
grand_slam
round
winner
loser

Question: What was the round in 1968?
SQL: SELECT "round" FROM tennis_grand_slams_2 WHERE "year" = 1968

Question: What is the round for a year earlier than 1987?
SQL: SELECT "round" FROM tennis_grand_slams_2 WHERE "year" < 1987

Question: What is the round when Grand Slam was the Davis Cup?
SQL: SELECT "round" FROM tennis_grand_slams_2 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 tennis_grand_slams_2 WHERE "year" = 1987 AND "round" = 'first round' AND "winner" = 'ivan lendl'