Table: tennis_match_results_4
Columns: outcome
date
surface
partner
opponents
score

Question: What was the surface for the game that had a partner of vania king?
SQL: SELECT "surface" FROM tennis_match_results_4 WHERE "partner" = 'vania king'

Question: Who was the partner for the game on October 20, 2013?
SQL: SELECT "partner" FROM tennis_match_results_4 WHERE "date" = 'october 20, 2013'