user: Question: What is the 1st leg of the Round that has a 2nd leg of 1-3 and Team 1 ES Tunis?
Columns: ['Team 1', 'Agg.', 'Team 2', '1st leg', '2nd leg']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AFC Leopards', '1-3', 'Al-Mourada SC', '1-0', '0-3']
SQL:

assistant: SELECT "1st leg" FROM "Table" WHERE "2nd leg" = '1-3' AND "Team 1" = 'ES Tunis';