user: Question: What was the partner of the team that faced the Guillermo García-López Albert Portas on Clay?
Columns: ['Outcome', 'Date', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '28 April 1997', 'Clay', 'Petr Luxa', 'Mahesh Bhupathi Leander Paes', '1–6, 1–6']
SQL:

assistant: SELECT "Partner" FROM "Table" WHERE "Surface" = 'Clay' AND "Opponents" = 'Guillermo García-López Albert Portas';