As with many of the all-time greats, Miller-Uibo showed greatness early: at just 13 years old, Miller-Uibo won five medals at the 2007 Central American and Caribbean Age-Group Championships. In 2010, she became the first Bahamian woman to win gold in the 400m at the World Under-20 Championships. A year later, she won gold over the same distance at the World Under-18 Championships, making her the first woman to ever simultaneously hold both titles.
Miller-Uibo enrolled at the University of Georgia in 2012 and was an immediate star for the Georgia Bulldogs. Miller-Uibo captured the NCAA Indoor 400m title for the Bulldogs and finished her outdoor campaign for Georgia with a second-place finish over 400m at the NCAA Outdoor Championships.
In 2014, her first season as a professional, Miller-Uibo won her first senior global medal, capturing the bronze medal in the 400m at the World Indoor Championships in Turkey. The following year, she finished a close-second at the World Outdoor Championships in Beijing. But it was in 2016 when Miller-Uibo cemented her place in the history books: at the Olympic Games in Rio de Janeiro, Miller-Uibo dramatically crosses the finish line and crashed to the track to just finish ahead of America’s Allyson Felix to win the Olympic gold medal at 400m. With her thrilling finish, Miller-Uibo became Bahama’s second Olympic Champion at 400m.
Since becoming the Olympic Champion, Miller-Uibo has expanded her range: in 2017, she won the bronze medal over 200m at the World Championships and the following year, took gold over the same distance at the Commonwealth Games in Australia. In 2019, Miller-Uibo won her third-straight Diamond League final over 200m and won silver in the 400m at the World Championships in Doha, the latter in a new life-time best of 48.37, a North American record and fast enough to make her the sixth-fastest woman in history.
Following a 2020 season limited by COVID-19 that still saw her go undefeated on the track, Shaunae returned to full international competition and qualified for the Tokyo Olympics in both the 200m and 400m. At Tokyo, Shaunae finished eighth in the 200m and stormed away with the gold in the 400m, in a new North American record of 48.36. With the win, Shaunae joined Marie-José Perec as the only other woman to successfully defend her Olympic 400m title.
While at the University of Georgia, Miller-Uibo met her husband, Maicel Uibo, Estonia’s leading decathlete. At the 2019 World Championships, only minutes after Shaunae won the silver medal in the 400m, husband Maicel won the silver medal in the decathlon, his first senior outdoor global medal.