user: Question: On which surface was the score w/o?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '5 August 2006', 'Saransk , Russia', 'Clay', 'Dekel Valtzer', 'Alexey Kedriouk Orest Tereshchuk', '4–6, 7–5, [5–10]']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Score" = 'w/o';