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_1547951_3 (surface VARCHAR, outcome VARCHAR, championship VARCHAR)
### Question:
Name the surfaace where outcome is runner-up and championship is us open
### Answer:
SELECT surface FROM table_1547951_3 WHERE outcome = "Runner-up" AND championship = "US Open"