Table: emilio_sanchez_tennis_stats
Columns: date
tournament
surface
opponent_in_final
score_in_final

Question: What is Date, when Opponent in Final is "Guy Forget"?
SQL: SELECT "date" FROM emilio_sanchez_tennis_stats WHERE "opponent_in_final" = 'guy forget'

Question: What is Opponent in Final, when Date is "13 January 1992"?
SQL: SELECT "opponent_in_final" FROM emilio_sanchez_tennis_stats WHERE "date" = '13 january 1992'

Question: What is Opponent in Final, when Surface is "Hard", and when Date is "13 January 1992"?
SQL: SELECT "opponent_in_final" FROM emilio_sanchez_tennis_stats WHERE "surface" = 'hard' AND "date" = '13 january 1992'