ใครคือรองแชมป์ของ john mcenroe 6–2 6–3?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Who is the runner up for the champion of john mcenroe 6–2 6–3?It is not neccessary to use all the tables.
 table_21584646_10:  (runner_up [ VARCHAR ] champion [ VARCHAR) ]
SELECT runner_up FROM table_21584646_10 WHERE champion = "John McEnroe 6–2, 6–3"