Table: tennis_match_results_78
Columns: event
round
surface
winner
opponent
result

Question: Which Surface has a Result of fernando verdasco?
SQL: SELECT "surface" FROM tennis_match_results_78 WHERE "result" = 'fernando verdasco'

Question: How many events did clay win?
SQL: SELECT COUNT("event") FROM tennis_match_results_78 WHERE "winner" = 'clay'

Question: Which Surface has an Opponent of rafael nadal, and an Event of 2?
SQL: SELECT "surface" FROM tennis_match_results_78 WHERE "opponent" = 'rafael nadal' AND "event" = 2

Question: Who is iván navarro's opponent?
SQL: SELECT "opponent" FROM tennis_match_results_78 WHERE "result" = 'iván navarro'

Question: Which Event has a Surface of semifinal, and a Winner of hard (i)?
SQL: SELECT MAX("event") FROM tennis_match_results_78 WHERE "surface" = 'semifinal' AND "winner" = 'hard (i)'