Laura Kenny and Katie Archibald took gold for Great Britain as they won the first ever Olympic women's Madison in dominant fashion.
However, there was disappointment for Ireland's Emily Kay and Shannon McCurley as they failed to finish a crash-strewn race at the Izu Velodrome.
The Irish pair fell behind early on and never recovered from a crash involving McCurley and Italy’s Elisa Balsamo.
They subsequently lost two laps and dropped out of the race without managing to score any points in the sprints.
It was a fifth career Olympic gold for Kenny, who surpassed Dutchwoman Leontien Zijlaard-Van Moorsel to become the most successful female cyclist in Olympic history as she took gold at a third consecutive Games.
She now also moves clear of Charlotte Dujardin as the British female with the most gold medals.
The British pair looked in control from the off, winning the first three sprints on the track.
They further extended their advantage after the Dutch pair of Kirsten Wild and Amy Pieters, reigning world champions, were caught in a crash with a little over 70 laps remaining.
In the second half of the race the British duo got themselves in a series of breakaways, hoovering up points in the sprints and gaining a lap with a little over 20 to go to build an all-but-insurmountable lead.
By the end of the race, they had won 10 of the 12 sprints, including the double points for the last lap, to finish with 78 points, more than twice the tally of second-placed Denmark on 35.
"It's unbelievable," Kenny told the BBC of her achievement. "I am just so glad.
"I have never wanted to win a race so badly in my life. It was giving me fears like never before. But we went and did it."
Archibald said: "I've been dreaming about this. I've never wanted something so much and I've never been so nervous. But we've been clinical in our approach.
"I'd like to thank our coach Monica (Greenwood). None of this would have happened without Monica. She overhauled our approach to this event."
