2018

On March 17 at the Bob Hayes Invitational in Jacksonville, Florida, Williams broke the world age-15 record in the girls' 100 metres, winning in a time of 11.13 seconds. The previous record had been 11.17 seconds, set almost 27 years prior by Marion Jones on 1 June 1991.^[6][7]

Two weeks later she earned gold medals in the 100 metres, the 200 metres, and the 4 × 100 metres relay at the 2018 CARIFTA Games in the under-17 category, setting championship records in the 100 metres and 4 × 100 metres relay.^[10][11][12]

In July she became the youngest athlete ever to win both the women's 100 metres and the 200 metres at the 2018 IAAF World U20 Championships in Tampere.^[13][5][14]

2019

At the 2019 CARIFTA Games in April, Williams again tripled in the 100 m, 200 m, and 4 × 100 m relay to win three gold medals in the under-20 category.^[15][16]

On 1 June, Williams set a new Jamaican under-18 and under-20 record in the women's 100 metres at the JAC Open in Jacksonville, Florida, improving on Kiara Grant's under-20 record set the month prior by one hundredth of a second to 11.10 seconds.^[8] Grant took the record back a week later at the NCAA Division I Championships in Austin, Texas with a 11.04 seconds finish in the final, but less than an hour later Williams improved the record to 11.02 seconds at the Great Southwest Classic in Albuquerque, New Mexico.^[9]

Williams ran 10.94 s in the 100 m final at the Jamaican Championships on 21 June 2019, which would have set the world under-18 best time and improved her Jamaican under-20 record.^{[17][18][19][20]} However, she tested positive for the banned diuretic hydrochlorothiazide during the competition. While she was ruled to be not at fault and received no period of ineligibility to compete, her results from the Jamaican Championships were deleted from the records.^[21][22][23]

2021

Williams improved her official Jamaican under-20 record of 11.02 seconds in the women's 100 metres at the JAC Summer Open in Jacksonville, Florida on 30 May, clocking 11.19 seconds in the prelims and then winning the final in 11.01 seconds.^[24] A day later in the American Track League at the same track she ran 10.97 in the prelims, but the time was assisted by a +2.5 m/s wind, making it ineligible for record purposes which allow no more than a +2.0 m/s wind velocity. In the final she clocked 10.98 seconds to win with only a +1.0 m/s wind, setting her second Jamaican under-20 record in two days.^[25] In June 2021, Williams placed fourth at the Jamaican National Championships with a time of 11.01 in the 100 metres, thus not qualifying for the 2020 Summer Olympics in that event.^[23] However, she competed at the Olympics as a part of the 4 x 100 metres relay team, winning the gold medal.

Personal bests

International competitions

More information Year, Competition ...

Representing  Jamaica

Year	Competition	Venue	Position	Event	Time	Wind (m/s)	Notes
2017	CARIFTA Games (U18)	Willemstad, Curaçao	3rd	100 m	11.80	−1.6
2018	CARIFTA Games (U17)	Nassau, Bahamas	1st	100 m	11.27	+1.6	CR[30][11]
			1st	200 m	23.11	+1.1	PB
			1st	4 × 100 m relay	44.95	—	PB CR[10][11]
	World U20 Championships	Tampere, Finland	1st	100 m	11.16	0.0
			1st	200 m	22.50	−0.1	NU18R NU20R CR[13][5][14]
2019	CARIFTA Games (U20)	Georgetown, Cayman Islands	1st	100 m	11.25	+0.3	SB
			1st	200 m	22.89	+0.9	SB
			1st	4 × 100 m relay	44.25	—	PB
	NACAC U18 Championships	Querétaro, Mexico	1st	100 m	11.11	+1.5	CR
	Pan American U20 Championships	San José, Costa Rica	1st	100 m	11.38	−1.4
			2nd	4 × 100 m relay	44.36	—
2021	Olympic Games	Tokyo, Japan	1st	4 × 100 m relay	41.02	—	NR
2022	World Indoor Championships	Belgrade, Serbia	6th	60 m	7.04	—
2024	World Indoor Championships	Glasgow, United Kingdom	14th (sf)	60 m	7.19	—

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National championships

Seasonal bests

• w = wind-assisted (over +2.0 m/s)