In August 2011, he placed 7th at the 2011 CS Asian Trophy in the junior men's competition. In November 2011, he placed 9th at the 2012 Japan Junior Championships.
During the 2013–14 season, Tomono competed at the 2014 Japan Championships at both the junior and senior men's competition. He placed 6th in the junior men's competition and 20th in the senior men's competition. In March 2014, he won the silver medal at 2014 International Challenge Cup in the junior men's competition.
In the 2014–15 season, Tomono competed at both the junior and senior men's competition at the 2015 Japan Championships. He placed 4th in the junior men's competition and 18th in the senior men's competition. In March 2015, he won the silver medal at the 2015 Coupe Du Printemps in the junior men's competition.
Tomono debuted on the ISU Junior Grand Prix (JGP) series in August 2015, placing 13th in Riga, Latvia. He won the silver medal at the 2015–16 Japan Junior Championships and placed 16th at the senior men's competition. He was brought in to compete at the 2016 World Junior Championships in Debrecen, Hungary, as a late alternate after Sota Yamamoto withdrew. He qualified for the free skate in Hungary by placing 20th in the short program. His 12th place in the free skate lifted him to 15th overall.
2016–2017 season: National junior title
Competing in the 2016–17 JGP series, Tomono placed fourth in Yokohama, Japan, and won the bronze medal in Ljubljana, Slovenia. He won the national junior title in November 2016 and placed fifth on the senior level at the Japan Championships in December 2016. He qualified for the free skate at the 2017 World Junior Championships in Taipei, Taiwan and placed 9th overall, 14th in the short program and 7th in the free skate.
He was selected to compete at the 2018 Worlds in Milan, Italy, after the withdrawal of Yuzuru Hanyu. He finished eleventh in the short program, third in the free skate, and fifth overall, setting new personal bests in all segments of the competition. His breakout performances and result helped Team Japan secure three berths for the 2019 World Figure Skating Championships.
At the 2020 Japan Championships, he placed sixth overall after placing eleventh in the short program and fourth in the free skate. With gold medalist Shoma Uno declining the invitation, Tomono was sent to the 2020 Four Continents Championships, where he finished seventh, setting new personal bests in all segments of the competition.[5]
2020–2021 season
Competing domestically, Tomono won the silver medal at the Western Sectionals championship, qualifying for a berth at the national championships.[6] With the COVID-19 pandemic affecting international travel, the Grand Prix was assigned primarily based on geographic location, and Tomono competed at the 2020 NHK Trophy in an all-Japanese men's field. He placed second in the short program, 3.99 points behind Yuma Kagiyama.[7] In the free skate, he doubled a quad attempt and turned out of another, among other jump errors, remaining in second place overall to take the silver medal, albeit nearly 50 points behind gold medalist Kagiyama's score. He assessed his errors as resulting from being "too careful."[8]
Tomono's first Grand Prix assignment was initially the 2021 Cup of China, but following its cancellation, he was reassigned to the 2021 Gran Premio d'Italia in Turin.[10] He placed sixth at the event.[11] At his second assignment, the 2021 Rostelecom Cup, he placed first in the short program and fifth in the free to finish third overall, setting new personal bests in all segments of the competition.[12][13] This was the third Grand Prix medal of his career.[14]
Following injury-related withdrawals by national champion Yuzuru Hanyu and first alternate Kao Miura, Tomono was named to the Japanese team for the 2022 World Championships.[17] As a result of the International Skating Union banning all Russian athletes due to their country's invasion of Ukraine and the absences of Hanyu and Nathan Chen due to injury, the World Championships men's field was considered more open than usual.[18] A clean skate in the short program earned Tomono a new personal best and a small bronze medal for third place, sweeping the segment alongside fellow Japanese skaters Shoma Uno and Yuma Kagiyama.[19] In the free skate, Tomono made a number of errors, dropping to sixth place overall. Speaking afterwards, Tomono expressed gratitude for "this wonderful opportunity to skate at the end of the season" while also noting that he had "regrets that I couldn't put on my best in this performance. I didn't really feel pressured, it was more the lack of practice, and I realized that I am not yet ready to be on the podium, so I need to practice harder."[20]
2022–2023 season
In his first event of the season, Tomono came fourth at the 2022 CS Nebelhorn Trophy, including a third-place finish in the free skate.[21] He placed second in the short program at the 2022 Grand Prix de France, the first of his two Grand Prix assignments, but dropped to third overall after the free skate and earned the bronze medal. He admitted to "some regrets to my performance" in the free, vowing to improve his mental consistency while under pressure to win. He praised the French audience at the event.[22] After missing his quad Salchow in the short program at the 2022 NHK Trophy, he placed fourth in that segment.[23] Despite being third in the free skate, he remained in fourth place overall, 2.93 points behind bronze medalist Cha Jun-hwan.[24][25]
Tomono was fourth in both segments at the 2022–23 Japan Championships, but placed third overall, winning the bronze medal and standing on the senior national podium for the first time in his career.[26][27] He was named to compete at the 2023 World Championships, held on home ice in Saitama.[28]
In the short program in Saitama, Tomono finished seventh in the segment despite falling on an underrotated quad Salchow attempt.[29] He set a new personal best in the free skate despite a fall on a quad toe loop, scoring 180.73 and rising to sixth overall.[30] Tomono was then named to Team Japan for the 2023 World Team Trophy the following month. He came seventh in this short program as well with another quad Salchow fall.[31] He was ninth in the free skate, having made several jump errors. Team Japan won the bronze medal.[32]
Tomono won the silver medal at the 2023 CS Nebelhorn Trophy in his first competition of the season.[21] He was invited to participate in the Japan Open as part of the host team, coming second in the men's segment behind Ilia Malinin, while Team Japan won gold.[34]
Appearing on the Grand Prix at the 2023 Skate Canada International, Tomono came third in the short program, but in the free skate he made three errors on his quad jumps and fell in the step sequence. He finished fifth in that segment, and dropped to fourth place overall, finishing 0.89 points behind bronze medalist Matteo Rizzo of Italy. He said afterward that his "skating condition was not at my max today."[35] Tomono was fourth as well at the 2023 Cup of China.[36]
During the off-season, Tomono sustained a hip injury and he acknowledged going into his first competition of the season, the 2024 Grand Prix de France that he did not have the optimal training time to practice his jumps. He would place fifth at the event after finishing third in the short program and sixth in the free skate.[40][41] Two weeks later, at the 2024 Finlandia Trophy, Tomono would place second in the short program but only seventh in the free skate, falling to sixth place overall.[40]
At the 2024–25 Japan Championships, Tomono placed third in the short program but struggled during the free skate, only placing eighth in that segment, and dropping to fifth place overall. He expressed frustration with result, saying, "What I regret most is that I was unable to achieve results with so many people watching at home."[40][43] Despite this, Tomono was subsequently named to the Four Continents team and selected as the second alternate to the 2025 World Championship team.[44][45][46]
^"友野一希がSP自己新で首位発進 自らを褒め「よくこれだけいい演技ができた」 田中刑事は出遅れ10位" [Kazuki Tomono takes the lead with SP self-new praises himself "I was able to perform so well" Detective Tanaka is late in 10th place]. sponichi.co.jp (in Japanese). Sports Nippon (Sponichi Annex). November 26, 2021. Archived from the original on November 27, 2021.
^"友野一希 日本勢最高の２位「今回は完敗、今までで感じたことない悔しさ」」" [Kazuki Tomono 2nd place, the highest in Japan "This time I was completely defeated, a regret I have never felt before"]. Nikkan Sports (in Japanese). January 23, 2022. Archived from the original on January 24, 2022.
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