TAMPERE, Finland, (CMC) –  Sprint sensation Briana Williams completed a rare sprint double at the IAAF World Under-20 Championships to help push Jamaica closer to a record medal haul.

The 16-year-old Williams became just the fourth woman in the history of the competition to win both the 100 and 200 metre events when she sped to victory in the latter on Saturday in a time of 22.50 seconds.

Williams, the CARIFTA Under-17 sprint champion, had already won gold in the 100 metres in 11.16 seconds two days earlier.

Jamaica has so far captured nine medals — three gold, four silver and two bronze – meaning they have equalled their second-best haul ever at these championships and need just two medals to equal their highest ever total of 11 achieved at home in Kingston in 2002.

Jamaica has won nine medals on two other occasions; in 1992 when the event was held in Seoul, South Korea, and again in 2004 in Grosetto, Italy.

They have the opportunity to add another four medals on Sunday’s final day with three individual athletes and the women’s 4x400m relay team competing.

Discus thrower Kai Chang, sprint hurdler Britney Anderson and high jumper Lamara Distin all qualified for the final of their respective events, along with the women’s mile-relay team.

However, there was major disappointment for the men’s 4x400m relay team after they were disqualified.

The team of Malik Smith, Dashawn Morris, Anthony Carpenter and Shemar Chambers clocked 3:07.65 to place second in their semi-final heat to Great Britain who ran a world-leading 3:07.17.

Smith was ruled to have run on the line on the opening leg and the team was disqualified, a decision that was upheld after a protest from the team’s management.

There were high hopes for the team, and with the expected inclusion of 400m medallists Christopher Taylor and Chantz Sawyers, they were expected to challenge, not just the National Junior Record of 3:03.77, but also the championships record of 3:01.09 held by the USA.