|4x400 m relay|
|4x400 m relay|
Williams is best known for winning the silver medal in the 200 metres at the 2001 World Championships. In 2001 he was named Jamaica Sportsman of the Year. Williams has competed in the Olympic Games three times, in 2000, 2004 and 2008, reaching the semi-finals of the 200m on all occasions. He was on the bronze medal-winning 4 x 400 metre relay team at the 2000 Olympics. He finished seventh in the 200m final at the 2007 World Championships.
Williams represented Jamaica at the 2008 Summer Olympics in Beijing. He competed at the 200 metres and placed third in his first round heat after Brian Dzingai and Christian Malcolm in a time of 20.53 seconds. He improved his time in the second round to 20.28 seconds and placed third again, this time after Dzingai and Walter Dix. He ran his semi final race in 20.45 seconds and placed sixth, which was not enough to make it to the Olympic final.
|1999||Central American and Caribbean Championships||Bridgetown, Barbados||1st||200 metres|
|Pan American Games||Winnipeg, Canada||3rd||4 × 100 m relay|
|2000||Summer Olympics||Sydney, Australia||3rd||4 × 400 m relay|
|2001||World Indoor Championships||Lisbon, Portugal||4th||200 metres|
|World Championships||Edmonton, Canada||2nd||200 metres|
|2nd||4 × 400 m relay|
|2002||Central American and Caribbean Games||San Salvador, El Salvador||2nd||200 metres||21.04 (wind: -0.4 m/s)|
|2003||Pan American Games||Santo Domingo, Dominican Republic||2nd||200 metres|
|Central American and Caribbean Championships||St. George's, Grenada||3rd||200 metres|
|2005||World Athletics Final||Monte Carlo, Monaco||2nd||200 metres|
|2006||Commonwealth Games||Melbourne, Australia||3rd||200 metres|