RIO DE JANEIRO -- Hungary goaltender Viktor Nagy held his fingers to his lips, and the crowd responded with a loud round of boos.Brazil was looking to win Group A in the Olympic mens water polo tournament. Australia was hoping to sneak into the quarterfinals. Nagy had other ideas.Nagy made 12 saves, and Hungary beat Brazil 10-6 on Sunday to remain the only unbeaten team in the competition.Thats his standard. When he is in good form, he is the best goalie in the world, Hungary driver Daniel Varga said. I think in the last three games if he shows this performance we got a chance to win (the) Olympic Games.Hungary improved to 2-0-3 for a Group A-best seven points. Spain played to a 9-9 draw with Montenegro earlier in the day and topped Group B with seven points.Hungary and Montenegro will face off in Tuesdays quarterfinals, and Spain will play world champion Serbia. Greece takes on Italy, and Braz