Table schema:
CREATE TABLE table_15001681_1 (mixed_doubles VARCHAR, womens_singles VARCHAR, mens_singles VARCHAR)

Question: In 2001, where the mens singles is armand jehle and the womens singles is michaela ritter, who are the mixed doubles
SQL: SELECT mixed_doubles FROM table_15001681_1 WHERE womens_singles = "Michaela Ritter" AND mens_singles = "Armand Jehle"