During his career, Kasai has broken numerous ski jumping records. In 2016, he was honoured with two Guinness World Records certificates for the most individual World Cup starts, not only in ski jumping, but in all World Cup disciplines organized by the International Ski Federation. At World Cup level, Kasai competed for a total of 33 seasons between 1988–89 and 2023–24.
He won his first and to date only major championship at the FIS Ski Flying World Championships 1992 in Harrachov, Czechoslovakia. He won after a second day of competition which was cancelled after strong winds and a crash of Christof Duffner. At that time he was among the world's top jumpers, known for his extraordinary style, holding his body almost flat between his skis.
1994: Olympic team medal
In 1994, he was a member of the Japanese national team that won a silver medal in the team large hill and finished fifth in the individual large hill at the Winter Olympics in Lillehammer. After breaking his shoulder he missed the entire 1994–95 season.
1999: Nordic Tournament
In 1999, Kasai won the ski jumping competition at the Holmenkollen Ski Festival and Nordic Tournament overall title. He collected a total of seven medals at the Nordic World Championships, including two silver (team large hill in 1999 and 2003) and five bronze medals (individual normal hill and individual large hill in 2003, team large hill in 2007 and 2009, and mixed team normal hill in 2015). At the 2010 Winter Olympics in Vancouver, he finished eighth on the large hill and 17th on the normal hill.
On 4 March 2016, Kasai was on a World Cup podium in Wisła at the age of 43 years and 272 days, which is a record for the oldest contestant to mount the podium in ski jumping history.[4] On 17 March 2016, he made his 500th individual start in the World Cup.[5]
During his career, Kasai broke numerous ski jumping records and age milestones. He is the oldest athlete to ever perform in the FIS Ski Jumping World Cup and holds the record for the most appearances in the competition, with a total of 578 individual starts in 33 seasons between 1988–89 and 2023–24.[7][8] Kasai also holds a record number of appearances in ski jumping at the Winter Olympics (21 starts), FIS Nordic World Ski Championships (42 starts), and FIS Ski Flying World Championships (13 starts).[9][10][11] In 2016, he was awarded with two Guinness World Records certificates for "the most appearances in FIS Nordic World Ski Championships by an individual ski jumper" and "the most individual starts in FIS Ski Jumping World Cup competitions".[12] In November 2014, Kasai became the oldest individual World Cup event winner, aged 42 years and 5 months.[3][13] He is also the oldest competitor to make a World Cup podium, aged 44 years and 9 months.[14]
Kasai is the first athlete in history to participate at eight Winter Olympics (between 1992 and 2018).[15] At the 2014 Winter Olympics, he became the oldest Olympic medalist in ski jumping after winning a silver medal aged 41 years and 254 days.[2]
Personal life
On 30 January 2016 his wife gave birth to their daughter named Rino.[16][17]