CREATE TABLE table_55416 ("Edition" TEXT, "Round" TEXT, "Date" TEXT, "Surface" TEXT, "Opponent" TEXT, "Result" TEXT)

For what round was the opponent mercedes paz with a result of 4 6, 6 1, 6 3?
SELECT "Round" FROM table_55416 WHERE "Opponent" = 'mercedes paz' AND "Result" = '4–6, 6–1, 6–3'
SELECT "Round" FROM "table_55416" WHERE "Opponent" = 'mercedes paz' AND "Result" = '4–6, 6–1, 6–3'