FIFA President Sepp Blatter has urged fair play in campaigning and voting ahead of next month's Asian Football Confederation (AFC) Congress amid a power struggle in the Asian game. With AFC chief Mohamed Bin Hammam taking on Bahraini Salman bin Ebrahim Al-Khalifa for his FIFA executive committee seat, Blatter called for both candidates to follow the rules.Both candidates have attacked each other via the media, with Al-Khalifa accusing Bin Hammam of mismanaging Asian soccer and the AFC president claiming his opponent is a stooge for well-heeled rivals keen to oust him.