Table: tennis_match_results_18
Columns: outcome
date
tournament
surface
partner
opponents
score

Question: Which tournament had an opponent of petra krejsová tereza smitková?
SQL: SELECT "tournament" FROM tennis_match_results_18 WHERE "opponents" = 'petra krejsová tereza smitková'

Question: What was the outcome when darija jurak anaïs laurendon was the opponent?
SQL: SELECT "outcome" FROM tennis_match_results_18 WHERE "opponents" = 'darija jurak anaïs laurendon'

Question: When was the outcome runner-up with a score of 4–6, 3–6?
SQL: SELECT "date" FROM tennis_match_results_18 WHERE "outcome" = 'runner-up' AND "score" = '4–6, 3–6'