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

Question: What is Tournament, when Date is "6 April 1992"?
SQL: SELECT "tournament" FROM wayne_ferreira_matches WHERE "date" = '6 april 1992'

Question: What is Surface, when Opponents is "Daniel Nestor Sandon Stolle"?
SQL: SELECT "surface" FROM wayne_ferreira_matches WHERE "opponents" = 'daniel nestor sandon stolle'

Question: What is Date, when Outcome is "Winner", and when Opponents is "Paul Haarhuis Sandon Stolle"?
SQL: SELECT "date" FROM wayne_ferreira_matches WHERE "outcome" = 'winner' AND "opponents" = 'paul haarhuis sandon stolle'

Question: What is Outcome, when Partner is "Byron Black", and when Opponents is "Goran Ivanišević Brian Macphie"?
SQL: SELECT "outcome" FROM wayne_ferreira_matches WHERE "partner" = 'byron black' AND "opponents" = 'goran ivanišević brian macphie'

Question: What is Tournament, when Date is "9 August 1993"?
SQL: SELECT "tournament" FROM wayne_ferreira_matches WHERE "date" = '9 august 1993'