Table: hercog_matches
Columns: date
tournament
surface
opponent
score

Question: Who was the opponent in the mallorca 2, spain tournament?
SQL: SELECT "opponent" FROM hercog_matches WHERE "tournament" = 'mallorca 2, spain'

Question: When was varvara lepchenko the opponent?
SQL: SELECT "date" FROM hercog_matches WHERE "opponent" = 'varvara lepchenko'