The Tokyo Olympics is forecast to be New Zealand's most successful Games, according to an analysis website.

Gracenote Sports is predicting New Zealand will finish with 21 medals, and the majority of those are set to be gold with a final medal tally of 12 gold, three silver and six bronze for 14th overall.

That would be New Zealand's biggest total haul and easily the most gold medals at an Olympics. The site doesn't breakdown each predicted medal winner.

The last Olympics in Rio was New Zealand's best Games with 18 total medals, while the most gold won was set in Los Angeles 1984 with eight.

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Gracenote supplies analysis for leagues around the world and has had a solid track record forecasting recent Olympics.

With the Olympics six months away, the company predicts the United States and China are picked to finish 1-2 in the overall medal count and the gold-medal count.

That's the easy part in a forecast done by Gracenote Sports about which countries will win the most Olympic medals.

The United States and China are easy to handle. The tough part is figuring out how to deal with Russia.

Russia is facing a four-year Olympic ban for manipulating doping data. It has appealed to the Court of Arbitration for Sport with a ruling expected in several months.

The sanctions imposed by the World Anti-Doping Agency forbid the use of the Russian team name, flag, or anthem. However, some Russian athletes are still expected to compete as neutrals — as they did in the 2018 Winter Olympics in Pyeongchang. Of course, no one knows how many.

All of this really fouls up Gracenote's calculations.

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First, a look at the United States and China with the Olympics opening on July 24.

Gracenote, which forecasts medals based on performances in major events since the last Olympics in Rio de Janeiro, has the United States leading the overall medal count with 117, and the gold-medal count with 47.

China is picked to win 87 overall and 43 gold.

Russia is next with 66 overall and 25 gold, followed by host nation Japan with 65 overall and 30 gold.

Japan is expected to take advantage of the host-nation advantage, which happens at every Olympics. It won a national record of 41 overall medals four years ago in Rio de Janeiro, and 12 gold. Its medals return this time should be a vast improvement, partly due to success in new sports, or returning sports like baseball and softball.

Russia is the headache.

"It remains to be seen how many of the 66 medalists (from Russia) currently forecast by Gracenote will be allowed to compete," Simon Gleave, the head of sports analysis at Gracenote, wrote in an analysis.

Of course, the absence of any potential Russian medal winner opens a chance for somebody else. Gracenote says the United States will benefit the most if no Russian athletes compete. Gracenote figures the United States would win nine more medals, and Italy would be next with a gain of six.

Gracenote's prediction record is decent.

In Rio de Janeiro, Gracenote picked the order of the top three countries correctly, and picked eight of the top 10 medal-winning countries. In Pyeongchang in 2018 it correctly picked Norway to win a record number of medals and finish ahead of No. 2 Germany.

It also picked the top four countries correctly in Pyeongchang, and in the correct order. Its predictions for seven of the top 10 countries were within one or two medals of their final totals.

Following the United States, China, Russia, and Japan, the next six countries in Tokyo in the order of overall medals are predicted to be: Australia (44), Britain (42), Netherlands (41), France (37), Germany (35), and Italy (32).

The second 10: South Korea (26), Hungary (23), Canada (22), New Zealand (21), Brazil (21), Turkey (18), Spain (18), Poland (18), Ukraine (16), Kenya (15).

And the third 10: Sweden (14), Serbia (13), India (12), Cuba (11), Taiwan (11), Kazakhstan (11), North Korea (10), Georgia (10), Jamaica (10), Iran (9).

The countries with the largest improvement in overall medals are expected to be: Japan (24), Netherlands (22), China (17), Australia (15), Russia (11), India (10), Turkey (10), Taiwan (8), Hungary (8), South Korea (5), Hong Kong (5), Ukraine (5).

- With AP