user: Question: How many opponents have Wimbledon (2) as the championship?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 1975.0, 'French Open', 'Clay', 'Chris Evert', 'Julie Anthony Olga Morozova', '6–3, 6–2']
SQL:

assistant: SELECT COUNT("Opponents") FROM "Table" WHERE "Championship" = 'Wimbledon (2)';