TOKYO (December 15) -- Masanosuke ONO recently announced that he had withdrawn from this week's Emperor's Cup All-Japan Championships for health reasons, a move that indefinitely delays the former world champion's return to the mats of his native country.

Ono revealed on social media that he had been diagnosed with a kidney problem, possibly linked to cutting weight to get down to 57kg, according to a report by Japan's top wrestling website Wrestling Spirits.

The Emperor's Cup is the first of two national domestic tournaments that will serve as qualifiers for this year's World Championships and Asian Games, the latter of which holds significance in that Japan will be hosting the event.

Ono has been competing at either 61kg or 65kg in recent years, and the stress of getting down to 57kg might have taken too big a toll. Ono said that he had gotten near 57kg the previous week when he experienced thickening of the urine, which can be regarded as a sign of dehydration.

Upon consultation with a doctor, it was decided "I will play it safe this time," Ono said.

The 22-year-old Ono has become a worldwide sensation, first by winning the senior world title at freestyle 61kg in 2024 with one-sided victories that included beating a past Olympic gold medalist and the reigning world champion, then for leaving the comfort of Yamanashi Gakuin University for the challenge of competing in American folkstyle at powerhouse Penn State University.

The Emperor's Cup would have provided a rare chance for Ono to compete in a freestyle tournament again, the first step on the path to getting back to the World Championships.

Ono said he will now return to Penn State, where he will resume his introduction into folkstyle. While he is redshirting this year -- the system that allows him to train with the team but not enter official competitions to preserve a year of eligibility -- he plans to enter an open tournament in January.

As pointed out by Wrestling Spirits, the big issue facing Ono now is whether or not he will be afforded a spot in the Meiji Cup All-Japan Invitational Championships in May next year, which will be the second domestic qualifier for the worlds and Asian Games.

As the name implies, the field is limited to invitees, using criteria set by the Japan Wrestling Federation based on results from major competitions over the past year. There are exceptions made for a wrestler who has been out of action for an extended time but has achieved "particularly outstanding results."

In the past, this has been interpreted to mean medaling at an Olympics, as the majority of wrestlers take time off following Olympic success. The question the federation will have to answer is, will a world title in 2024 earn Ono an invitation?

Asked directly by Wrestling Spirits, Kenji INOUE, the federation's chairman of the technical enhancement committee, replied, "At this stage, nothing has been decided."

There is one incentive for the publicity-starved JWF to include Ono in the Meiji Cup field -- it could set up a classic match-up between him and Paris Olympic champion Rei HIGUCHI.

Higuchi has not competed since winning the Paris gold, but has already stated he plans to return at the Meiji Cup with eyes on a first Asian Games appearance.

Ono has not competed in Japan since June 2024, when he participated in the East Japan Collegiate League, a team competition in which he helped Yamanashi Gakuin win the Division I title.

After winning the gold at the Non-Olympic World Championships in Tirana in October 2024, he revealed he had been dealing with a broken ankle.

That kept him out of competition for awhile, then early in 2025, he headed across the Pacific to begin training with the Nittany Lion Wrestling Club. In March, he made the blockbuster announcement that he would enroll at Penn State.

Ono had been entered at 57kg at the Bill Farrell Memorial Invitational in New York in November, but was a late withdrawal for undisclosed reasons.

The four-day Emperor's Cup begins on Thursday at Tokyo's Komazawa Gym. Olympic weight classes will be contested over two days in the same format at the World Championships, while non-Olympic weights will be finished in a single day.

The tournament will see the return to the mat of two Olympic champions for the first time since their victories in Paris. Kenichiro FUMITA has moved up from Greco 60kg to 63kg, while Yuka KAGAMI is entered at her usual weight of women's 76kg. Both will be in action on the first day.