Table: jiri_novak_matches
Columns: date
tournament
surface
opponent
score

Question: What was the surface for October 10, 2004?
SQL: SELECT "surface" FROM jiri_novak_matches WHERE "date" = 'october 10, 2004'

Question: What was the surface for the opponent Roger Federer?
SQL: SELECT "surface" FROM jiri_novak_matches WHERE "opponent" = 'roger federer'