Ireland's Mark Downey finished 17th overall in the omnium as Matt Walls delivered Great Britain's first title in the velodrome of these games.
The four-discipline event comprises a scratch race, a tempo race, an elimination race and a points race, each over 40 laps, meaning the competitors cover a total of 40km in the space of a few hours.
Downey finished 16th in the scratch race, 19th in the tempo race, with the 25-year-old the second rider dispatched in the elimination race, before achieving a 17th place in the concluding points race.
Afterwards, Downey said: "I didn't really know what to expect ... I’m an athlete, I like to compete, but look it’s my first omnium at this level. I threw the kitchen sink at it. It’s not a banging result, it is what it is.
"We got this race off the back of the Madison, so I’m looking forward to going again with Felix [English].
"He’s super motivated back in the hotel so I’m not too disappointed with the result. The level we know is really, really high here so I can’t be too disappointed, and we’ll move forward again."
Walls rode smartly throughout to win with a comfortable final margin of 24 points from Campbell Stewart of New Zealand.
Britain's European champion, who tested positive for Covid-19 in March, jointly led alongside Jan Willem Van Schip and Benjamin Thomas after the tempo race, but then outlasted the pair in the elimination race to take a narrow advantage into the decider.
He wasted little time in taking control as he gained a lap alongside American Gavin Hoover, winning the second sprint in the process.
That gave him a cushion of 30 points over the field, and from then on he could mark the likes of reigning champion Elia Viviani, Thomas and Stewart to the finish, with Viviani rounding off the podium.
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Irish coach Martyn Irvine said their focus would now be on their target race, the Madison, on Saturday.
He said: "Not the race we wanted but it shows we haven't focused on it in preparation and training.
"Given the year that’s in it, we were just happy to get a start on the race. It has set us up to build from here, the level has raised.
"We have shifted our focus to the main event of this week for us, the last two years we have focused on the Men’s madison and that’s the main goal on our side."