Japan gambled by resting top-ranked Kento Momota and nearly paid the price, suffering a huge scare before battling back to beat Russia 3-2 in its Sudirman Cup opener on Monday.

The top seed is bidding to win the mixed-team world championships for the first time, but a major shock was on the cards when the Japanese went 2-1 down.

The unfancied Russians enjoyed surprise victories in the men's singles and men's doubles, before the Japanese fought back in the Chinese city of Nanning.

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Japan, who along with the host are the favourites, decided to rest world champion Momota along with the first-choice men's pairing.

Japan was initially unaffected and won the mixed doubles in the opening rubber.

But Russia then took advantage of Japan's weakened side with Vladimir Malkov, ranked 62, beating Momota's replacement Kenta Nishimoto — 10th in the world — and also winning the men's doubles.

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But Japan's women saved the day for the team, World No. 2 Nozomi Okuhara thrashing Natalia Perminova in the women's singles to make it 2-2 in the tie.

The women's duo of Yuki Fukushima/Sayaka Hirota saw off Ekaterina Bolotova/Alina Davletova to save Japan from embarrassment.

“It was a relief to get the winning point,” said Fukushima.

“In the end it worked out well for us.”