Who was the opponent on clay surface when partnered with Horacio Zeballos?
CREATE TABLE table_name_23 (opponents VARCHAR, surface VARCHAR, partnering VARCHAR)
SELECT opponents FROM table_name_23 WHERE surface = "clay" AND partnering = "horacio zeballos"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_23 (opponents VARCHAR, surface VARCHAR, partnering VARCHAR) Question: Who was the opponent on clay surface when partnered with Horacio Zeballos? [/INST] SELECT opponents FROM table_name_23 WHERE surface = "clay" AND partnering = "horacio zeballos" </s>