Hungary won its eighth Olympic water polo gold medal, scoring three time in the last quarter Sunday to beat Serbia and Montenegro, 8-7.
In the title game, left-handed shooter Gergeley Kiss scored four goals, and Tamas Kasas had two for the defending world and Olympic champion.
Aleksandar Sapic, the tournament's leading scorer with 18 goals, got the ball with a chance to tie it in the closing seconds but didn't get a shot off in time.
The Hungarians became the first to win back-to-back Olympic titles since Yugoslavia -- now Serbia and Montenegro -- beat the United States in consecutive finals in 1984 and '88.
Revaz Chomakhidze scored four goals in Russia's win for the bronze. The Russians got the silver in Sydney.
Russia beat Greece, 6-5, for the bronze medal.
The United States upset Italy, 9-8, behind three goals apiece from Tony Azevedo and Jesse Smith to finish in seventh place.
"Winning that was totally important," Azevedo said. "The whole time, we've been saying the top three in our bracket are the three that are going to get the medals. This shows we could have been playing for a medal if we'd started in the other bracket."
No way Alina Kabaeva was letting the gold medal slip from her grasp this time.
Four years after watching her medal hopes end when she lost control of her hoop, the two-time world champion from Russia won the all-around in a rout. She finished with 108.400 points, more than a point ahead of silver medalist Irina Tchachina of Russia. Anna Bessonova of Ukraine took the bronze.
Kabaeva knew the gold was hers when she finished her last routine, shimmying her shoulders and shaking her hips as she walked off the mat. When the final results were posted, she exchanged a long hug with Tchachina and then gave fans a thumbs up.
Kabaeva was the heavy favorite to win gold in Sydney, but she had to settle for the bronze when her hoop skittered away from her and she had to run off the mat to get it. She won a second world title in 2001 but had to give it back after testing positive for a diuretic at the Goodwill Games. She also was banned from competition for a year.
Tchachina, second at the 2001 world championships, tested positive for the same drug and also had to give back her medal.
Kabaeva returned to competition last September at the world championships, winning another world title and establishing herself as the one to beat in Athens. And this time, she didn't falter. After finishing second to Tchachina in the first event, that dreaded hoop, Kabaeva won the last three.
South Korea's Moon Dae Sung unleashed a wicked roundhouse kick that knocked out local favorite Alexandros Nikolaidis of Greece in the first round of the heavyweight final.
Moon was leading 1-0 when he landed a high kick to the Greek fireman's head. The blow knocked Nikolaidis's helmet askew, and he collapsed on the mat for several seconds before officials came over to help him up.
Moon, the 1999 world champion, raised his hands in celebration while Nikolaidis regained his bearings. After several minutes, the South Korean went over to his opponent and helped him up.
The pair embraced, Moon held the Greek's arm up to the crowd's delight, and they paraded around the arena hand in hand.
Nikolaidis was left with the silver, and Pascal Gentil of France defended his bronze from the 2000 Sydney Games in the 176-pound (80kg) category, beating Jordan's Ibrahim Kamal, 6-2.
In the women's 148-pound final (67kg), China's Chen Zhong defeated Myriam Baverel of France, 12-5, and successfully defended her gold medal from Sydney. Adriana Carmona of Venezuela took the bronze medal.
World champion Croatia won the men's gold medal, finishing an undefeated run through the Olympic tournament with a 26-24 victory over Germany.
Germany started the tournament with impressive victories against Greece, Egypt and Brazil and got into the semifinals after winning a penalty shootout over Spain, 32-30. The Germans then beat defending Olympic champion Russia, 21-15, to reach the final.