Artificial rain extinguishes the Olympic flame. [Photo/Agencies]

American swimmer Michael Phelps summoned up his career in Rio by winning five more gold medals and one silver and raising his Olympic tally over five Games to 28 medals including 23 gold.

The United Sates topped the medal tally with 46 gold, 37 silver and 38 bronze medals, well ahead of Britain on 27-23-17.

China ranked third on 26-18-26 and capped their Rio trip with a perfect ending as the Chinese women's volleyball team was crowned after 12 years, leading to a nationwide celebration.

"With the sport excellence achieved by the Chinese athletes, Team China has met the expectations we set for these Olympics," said China's chef de mission Liu Peng on Saturday.

China, which sent to Rio 416 athletes including 35 returning Olympic champions, clean-swept four table tennis titles and seven out of eight diving gold medals on offer.