user: ### NOW ANSWER:
Question: Who won the mens singles when Sayaka Sato won the womens singles?
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1990.0, 'Nicholas Hall', 'Stephanie Spicer', 'Nicholas Hall Dean Galt', 'Rhona Robertson Lynne Scutt', 'Brent Chapman Tammy Jenkins']
SQL:

assistant: SELECT "Mens singles" FROM "Table" WHERE "Womens singles" = 'Sayaka Sato';