Damian Warner of Canada is leading the Olympic decathlon with 2,966 points after the first three events, AP reports.
The 2016 Olympic bronze medalist is 223 points clear of fellow Canadian Pierce Lepage and 255 ahead of 2018 world junior champion Ash Moloney of Australia.
Decathlon world record holder Kevin Mayer of France, the Olympic silver medalist from Rio and world champion in 2017, is in fourth spot with 2,662 points.
Warner opened the competition by equaling his world decathlon best time of 10.12 seconds in the 100 meters and then produced an Olympic decathlon best 8.24 meters in the long jump. He had 14.80 meters in the shot put, allowing Lepage and Mayer to close the gap.
In the heptathlon, defending Olympic champion Nafissatou Thiam is leading with 2,176 points after two disciplines, 19 points clear of American Erica Bougard.
Thiam was 15th after the 100-meter hurdles but picked up 1,132 points in the high jump by clearing 1.89 meters to take the lead. Bougard moved from fourth place into second by clearing 1.86 and 2019 world champion Katarina Johnson-Thompson moved from seventh to third place on 2,138 points with a best jump of 1.86.
Damian Warner, of Canada, competes in the shot put of the decathlon at the 2020 Summer Olympics, Wednesday, August 4, 2021, in Tokyo.