Table: tennis_match_results_21
Columns: outcome
date
surface
opponent
score

Question: Who is the opponent for the winner outcome on a hard surface on August 27, 2011?
SQL: SELECT "opponent" FROM tennis_match_results_21 WHERE "outcome" = 'winner' AND "surface" = 'hard' AND "date" = 'august 27, 2011'

Question: What was the outcome on August 5, 2007?
SQL: SELECT "outcome" FROM tennis_match_results_21 WHERE "date" = 'august 5, 2007'

Question: What was the score on January 16, 2010?
SQL: SELECT "score" FROM tennis_match_results_21 WHERE "date" = 'january 16, 2010'