List all the football player with the highest balance score and potential score of 61.
balance score refers to balance; highest balance score refers to MAX(balance); potential score refers to potential; potential = 61;
SELECT t1.player_name FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE t2.potential = '61' ORDER BY t2.balance DESC LIMIT 1