Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_19 (against VARCHAR, round VARCHAR, surface VARCHAR)
### Question:
Who was the match against when on a clay surface during round 2r?
### Answer:
SELECT against FROM table_name_19 WHERE round = "2r" AND surface = "clay"