user: Question: Which round had a winning driver of Uwe Alzen, at the Sepang International Circuit?
Columns: ['Round', 'Location', 'Circuit', 'Date', 'Winning Driver']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['NC', 'United Arab Emirates', 'Dubai Autodrome', 'January 25', 'Gianni Morbidelli']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Winning Driver" = 'Uwe Alzen' AND "Circuit" = 'Sepang International Circuit';