Kento Yamasaki won Japan's first world title in the men's keirin since 1987 as record-chasing Olympic gold medalist Harrie Lavreysen was eliminated in the semifinals.
It was one of two golds for Japan on the second night of the world track championships in Ballerup, Denmark, as Kazushige Kuboki then dominated the scratch race, a non-Olympic event.
Even though the keirin was invented in Japan, the country's only title in either men's or women's races at the world championships or Olympics was collected by Harumi Honda in Vienna 37 years ago.
On Thursday, Yamasaki brought the gold home when he outsprinted Israel's Mikhail Yakovlev and Colombia's reigning champion Kevin Quintero in the final.
Lavreysen, who won three straight keirin world titles from 2020 to 2022, was second in the consolation final to finish eighth overall.
The 27-year-old five-time Olympic champion took his overall tally to 14 world golds the night before as part of the Dutch sprint team. That matched the record set by Frenchman Arnaud Tournant between 1997 and 2008.
Lavreysen still has two races left in Ballerup to overtake Tournant. The Dutchman rides in the non-Olympic kilometer race on Friday and will try for a sixth straight individual sprint world title on Sunday.
The home team gave the fans a victory as Denmark defended its men's team pursuit title, beating Olympic runner-up Great Britain in the final.
The Danes had missed out on a medal in Paris. Olympic champion Australia did not enter.
Great Britain finished the evening by edging Germany in the women's pursuit.
New Zealand's Ally Wollaston upset Belgian star Lotte Kopecky in the women's elimination race.
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.