Table: tennis_match
Columns: outcome
date
championship
surface
opponent
score

Question: What is the surface on 21 june 1993?
SQL: SELECT "surface" FROM tennis_match WHERE "date" = '21 june 1993'

Question: what is the score when the championship is rome and the opponent is richard krajicek?
SQL: SELECT "score" FROM tennis_match WHERE "championship" = 'rome' AND "opponent" = 'richard krajicek'

Question: who is the opponent when the surface is clay, the outcome is winner and the championship is estoril on 15 april 1996?
SQL: SELECT "opponent" FROM tennis_match WHERE "surface" = 'clay' AND "outcome" = 'winner' AND "championship" = 'estoril' AND "date" = '15 april 1996'

Question: who is the opponent on 18 january 1993?
SQL: SELECT "opponent" FROM tennis_match WHERE "date" = '18 january 1993'

Question: what is the score when the outcome is winner against yevgeny kafelnikov?
SQL: SELECT "score" FROM tennis_match WHERE "outcome" = 'winner' AND "opponent" = 'yevgeny kafelnikov'