Table: tennis_match_6
Columns: tournament
surface
week
winner_and_score
finalist
semifinalists

Question: Which finalist played in the week of October 21?
SQL: SELECT "finalist" FROM tennis_match_6 WHERE "week" = 'october 21'

Question: On what surface did they play the match in the week of October 21?
SQL: SELECT "surface" FROM tennis_match_6 WHERE "week" = 'october 21'

Question: Who was the finalist in the Monte Carlo Tournament?
SQL: SELECT "finalist" FROM tennis_match_6 WHERE "tournament" = 'monte carlo'