Hitoshi Saito was a judo great who triumphed at consecutive Olympics in 1984 and 1988 at over 95 kilograms.

He died of cancer in 2015 aged 54 but his "spirit lives on" in his son, according to Yasuhiro Yamashita, a former Olympic champion who until last year headed Japan's judo federation.

Yamashita has long been convinced of the 22-year-old Saito's potential and said after watching him compete as a junior that they were witnessing a special talent.

"No other heavyweight can twist his hips as much as he does when he throws an opponent," Yamashita said.

Hitoshi Saito enjoyed world and Olympic success in the 1980s, but lost to Yamashita in three consecutive finals at the open-weight All-Japan Judo Championships.

He quipped that he had "climbed Everest but never climbed Mount Fuji", but he finally claimed the title in 1988 after Yamashita had retired.

- Pursuit of perfection -

His son did not have to wait anywhere near as long, winning the All-Japan Championships in 2022 to become the third-youngest victor at 20 years and one month.

The younger Saito now has the chance to scale the sport's highest peak in Paris and warmed up by beating Tajikistan's Temur Rakhimov in the final of the Grand Slam in Kazakhstan in May.

But Saito will likely have to go through 11-time world champion Teddy Riner if he is to triumph in Paris, with the Frenchman looking to win his third individual Olympic gold.

"I think I can win, I have no fear," Saito said after losing to Riner in the final of the Grand Slam in Turkey in March.

"I will get stronger. I just have to keep improving."

Saito stands 191cm (over six feet, two inches) and weighs 170kg (375 pounds), but his imposing physique is in contrast to his cherubic face and sunny disposition.

His mother Mieko has described him as a "bold" child whose behaviour would surprise those around him.

While his sensitive elder brother would cry if his mother bit the head off a bird-shaped candy, Saito would gleefully gobble one down whole.

It was brother Ichiro who first showed an interest in learning judo and Tatsuru tagged along -- much to the delight of their father.

He could be a harsh teacher, drilling moves over and over again in pursuit of perfection.

"If my dad were here now, as soon as he'd shaken my hand he'd be telling me what I needed to work on," local media quoted Saito as saying after he won the 2022 All-Japan title.

- Memories of dad -

Saito's world was rocked at aged 12 when his father developed a rare but rapidly developing form of liver cancer.

He believed that his father's strength as a judoka would see him overcome the illness, and it took around a month for the reality of his death to sink in.

"Little by little, once I started to accept it, I began to get more serious about my judo," Saito said.

"I felt I had to repay the people who had supported me, especially my dad."

Saito watches old clips of his father in action and wonders what advice his dad would give him in matters of technique.

Experts see close similarities between the two, although Saito plays down comparisons and protests that he is "nowhere near" his father's level yet.

He has ambitions of getting there one day, however, and watching the Tokyo Olympics on TV three years ago only fuelled his fire.

"It made me feel more than ever that I want to win a medal whatever it takes, to stand on top of that podium," Saito has said.

"At the Paris Olympics I want to stand in the place where my father once stood."