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_56 (year INTEGER, partnering VARCHAR, championship VARCHAR)
### Question:
What year was the US Open that had a partnering of Maikel Scheffers?
### Answer:
SELECT SUM(year) FROM table_name_56 WHERE partnering = "maikel scheffers" AND championship = "us open"