Table: tennis_match_results_16
Columns: outcome
date
surface
opponent
score

Question: What is the surface of the match when the outcome was runner-up, and a Score of julia görges polona hercog?
SQL: SELECT "surface" FROM tennis_match_results_16 WHERE "outcome" = 'runner-up' AND "score" = 'julia görges polona hercog'

Question: What was the surface of the match when the score was akgul amanmuradova chuang chia-jung?
SQL: SELECT "surface" FROM tennis_match_results_16 WHERE "score" = 'akgul amanmuradova chuang chia-jung'

Question: What date was the surface hard and Eva Hrdinová was the opponent?
SQL: SELECT "date" FROM tennis_match_results_16 WHERE "surface" = 'hard' AND "opponent" = 'eva hrdinová'

Question: What was the surface of the match against bethanie mattek-sands?
SQL: SELECT "surface" FROM tennis_match_results_16 WHERE "opponent" = 'bethanie mattek-sands'