2022: U.S. Champion and 4 × 100 m World championships gold Jefferson competed at
Coastal Carolina University and won the
NCAA Indoor 60 m Championship in 2022. She won the 100 metres at the
2022 USA Outdoor Track and Field Championships to qualify for the
2022 World Athletics Championships held in
Eugene, Oregon. Jefferson reached the final and finished eighth. She won gold as part of the
4 × 100 metres relay team.
2023: 4 × 100 m World championships gold In 2023, she placed 5th at the
2023 USA Outdoor Track and Field Championships and was selected for the relay team. The team won the 4 × 100 m relay at the
2023 World Athletics Championships held in
Budapest.
2024: 100 m Olympic bronze, 4 × 100 m gold In 2024, Jefferson was a member of the USA team which won the 4 × 100 m relay at the
2024 World Athletics Relays in
Nassau, Bahamas. She won the 100m at the
LA Grand Prix meet in May. In June, she finished second in the 100 metres at the
U.S. Olympic trials in Eugene, Oregon, in a new personal best of 10.80 seconds. At the
Paris Olympics, she won a bronze medal in the 100 m with a time of 10.92 s. She won gold as part of the 4 × 100 m relay team. (left), at the
2024 US Olympic trials 2025: Triple World Champion In September 2024, it was announced that Jefferson had signed up for the inaugural season of the
Michael Johnson founded
Grand Slam Track taking place in 2025. She won both the 100 metres and 200 metres races in the Short Sprints category, ahead of
Jenna Prandini and
Jacious Sears, at the inaugural
Grand Slam Track Kingston meeting on 5–6 April 2025, in
Kingston, Jamaica. Jefferson ran 10.75 (+2.4 wind) to win the women's 100 metres race at the second slam event in
Miami on 2 May 2025. The following day, she became the first athlete to claim back-to-back titles as third place in the 200 metres race, which meant she finished a point clear of 200 m winner
Gabby Thomas in the two-race format. She ran a personal best of 21.99 seconds to win the 200 metres race at the
2025 Philadelphia Slam on 31 May 2025, beating the 2024 Olympic champion in the 200m,
Gabby Thomas. The following day, she moved into the top-ten all-time for the 100 metres, running a personal best and current world lead of 10.73 seconds. She ran 10.75 seconds to beat Olympic champion
Julien Alfred into second in the 100 metres at the
2025 Prefontaine Classic on 5 July into a headwind (−1.5 m/s). She ran 10.65 seconds (+0.4) to win 100 metres at the
2025 USA Outdoor Track and Field Championships, in Eugene, with the time making her the joint-fifth-fastest woman in history. She also ran a personal best to win the 200 meters at the championships in 21.84 seconds. Later that month, she ran 10.66 seconds (+0.1) to win the 100 metres at the Diamond League event in Silesia, and 10.76 (−0.3) to win at the
2025 Memorial Van Damme in the Diamond League, in Brussels, Belgium. She also won the gold medal with the American team in the
women's 4 x 100 metres relay at the championships, completing the sprint triple. ==Personal life==