Table: tennis_finals_4
Columns: outcome
date
tournament
surface
partner
opponents_in_final
score_in_final

Question: Who was the opponents in the final that was played on April 16, 2006 and the outcome was runner-up?
SQL: SELECT "opponents_in_final" FROM tennis_finals_4 WHERE "outcome" = 'runner-up' AND "date" = 'april 16, 2006'

Question: Who were the opponents in the final when the game was played on hard surface and the score of the final was 6–1, 1–6, 7–6(4)?
SQL: SELECT "opponents_in_final" FROM tennis_finals_4 WHERE "surface" = 'hard' AND "score_in_final" = '6–1, 1–6, 7–6(4)'