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The United States' men finally bagged a track gold, via the 4x400m relay, while their star-studded women's quartet won their event for the seventh successive time, securing yet another medal for Allyson Felix.
Krystsina Tsimanouskaya, who was due to compete in the women's 200 metres on Monday, said she did not plan to return to her home country.
The 2008 Olympics long jump silver medallist tested positive for human growth hormone before the Tokyo Olympics.
The veteran who was adjuged to have lost in her pre-quarterfinal (51 kg) bout on Thursday has slammed the IOC's Boxing Task Force.
The 23-year-old, who finished runner-up to Canada's Margaret MacNeil in the 100m, touched the wall in 2:03.86, well ahead of the US pair Regan Smith and Hali Flickinger, to win China's first swimming gold of the Games.
Canada's Kylie Masse took a good lead from the start and held it at the halfway mark but McKeown switched gears out of the turn and clawed back to win in 57.47.
The American squeezed into the uneven bars final thanks to an Olympic rule that limits only two finalists per nation, with two higher-placed Russians missing out.
Chanu won India's first medal in Tokyo and became the second weightlifter from the country to clinch an Olympic medal.
The silver went to Russian shooter Anastasiia Galashina and the bronze medal went to Switzerland's Nina Christen in women's 10m air rifle.
Johnson won the final in a world record time 9.79 seconds, while Lewis took second place. However, Johnson's joy was shortlived as he was stripped of his gold medal after testing positive for the steroid stanolozol.