# William Collazo

William Collazo Gutiérrez (born 31 August 1986 in Antilla, Holguín) is a Cuban sprinter who specializes in the 400 metres.

## Career

He won a bronze medal in the 4 x 400 metres relay at the 2005 Central American and Caribbean Championships. He also competed at the 2007 World Championships, the 2008 Olympic Games and the 2009 World Championships, but without reaching the final round.
His personal best time is 44.93 seconds, achieved at the World Championships in August 2009 in Berlin. He also has 21.27 seconds in the 200 metres, achieved in March 2004 in Havana.

## Personal best

* 200 m: 21.04 s (wind: +0.7 m/s) – La Habana, 23 May 2010
* 400 m: 44.93 s – Berlin, 19 August 2009
* 400 m (indoor): 46.31 s – Doha, 13 March 2010

## International competitions

| Year | Competition | Venue | Position | Event | Notes |
| Representing Cuba ||||||
| 2005 | ALBA Games | Havana, Cuba | 4th | 200 m | 21.49 s (0.0 m/s) |
| 2005 | ALBA Games | Havana, Cuba | 1st | 400 m | 47.16 s |
| 2005 | ALBA Games | Havana, Cuba | 1st | 4 × 400 m | 3:08.14 min |
| 2005 | Central American and Caribbean Championships | Nassau, Bahamas | 8th | 400 m | 46.58 s |
| 2005 | Central American and Caribbean Championships | Nassau, Bahamas | 3rd | 4 × 400 m | 3:02.33 min |
| 2006 | NACAC Under-23 Championships | Santo Domingo, Dominican Republic | 3rd | 400 m | 45.72 s |
| 2006 | Central American and Caribbean Games | Cartagena, Colombia | 7th | 400 m | 46.95 s |
| 2006 | Central American and Caribbean Games | Cartagena, Colombia | 6th (h) | 4 × 400 m | 3:08.71 min |
| 2007 | ALBA Games | Caracas, Venezuela | 1st | 400 m | 45.68 s |
| 2007 | ALBA Games | Caracas, Venezuela | 1st | 4 × 400 m | 3:06.84 min |
| 2007 | Pan American Games | Rio de Janeiro, Brazil | 4th | 400 m | 45.45 s |
| 2007 | Pan American Games | Rio de Janeiro, Brazil | – (h) | 4 × 400 m | DQ |
| 2007 | World Championships | Osaka, Japan | 19th (sf) | 400 m | 45.54 s |
| 2008 | Ibero-American Championships | Iquique, Chile | 1st | 4 × 400 m | 3:03.22 min |
| 2008 | Central American and Caribbean Championships | Cali, Colombia | 4th | 400 m | 46.04 s |
| 2008 | Central American and Caribbean Championships | Cali, Colombia | 1st | 4 × 400 m | 3:02.10 min |
| 2008 | Olympic Games | Beijing, China | 13th (sf) | 400 m | 45.06 s |
| 2008 | Olympic Games | Beijing, China | 10th (h) | 4 × 400 m | 3:02.24 min |
| 2009 | ALBA Games | Havana, Cuba | 1st | 400 m | 45.74 s |
| 2009 | Central American and Caribbean Championships | Havana, Cuba | 1st | 400 m | 44.96 s |
| 2009 | Central American and Caribbean Championships | Havana, Cuba | 1st | 4 × 400 m | 3:03.26 min |
| 2009 | World Championships | Berlin, Germany | 7th (sf) | 400 m | 44.93 s |
| 2010 | World Indoor Championships | Doha, Qatar | 2nd | 400 m | 46.31 s |
| 2010 | Ibero-American Championships | San Fernando, Spain | 2nd | 400 m | 45.33 s |
| 2010 | Ibero-American Championships | San Fernando, Spain | 1st | 4 × 400 m | 3:04.86 min |
| 2011 | World Championships | Daegu, South Korea | 21st (sf) | 400 m | 46.13 s |
| 2011 | Pan American Games | Guadalajara, Mexico | 4th | 400 m | 45.33 s |
| 2011 | Pan American Games | Guadalajara, Mexico | 1st | 4 × 400 m | 2:59.43 min |
| 2012 | Ibero-American Championships | Barquisimeto, Venezuela | 2nd | 400 m | 45.81 s |
| 2012 | Ibero-American Championships | Barquisimeto, Venezuela | 1st | 4 × 400 m | 3:00.43 min |
| 2012 | Olympic Games | London, United Kingdom | 3rd (h)$^1$ | 4 × 400 m | 3:00.55 min |
| 2014 | World Relays | Nassau, Bahamas | 5th | 4 × 400 m | 3:00.61 min |
| 2014 | Central American and Caribbean Games | Xalapa, Mexico | 1st | 4 × 400 m | 3:00.70 min A |
| 2015 | IAAF World Relays | Nassau, Bahamas | 10th | 4 × 400 m | 3:03.73 min |
| 2015 | NACAC Championships | San José, Costa Rica | 4th (sf) | 400m | 46.30 s |
| 2015 | NACAC Championships | San José, Costa Rica | 3rd | 4 × 400 m | 3:01.22 min |
| 2015 | World Championships | Beijing, China | 7th | 4 × 400 m | 3:03.05 min |
| 2016 | Ibero-American Championships | Rio de Janeiro, Brazil | 7th | 400 m | 45.92 s |
| 2016 | Ibero-American Championships | Rio de Janeiro, Brazil | – | 4 × 400 m | DQ |
| 2016 | Olympic Games | Rio de Janeiro, Brazil | 6th | 4 × 400 m | 2:59.53 min |
| 2017 | IAAF World Relays | Nassau, Bahamas | 5th | 4 × 400 m | 3:03.60 min |
| 2017 | World Championships | London, United Kingdom | 6th | 4 × 400 m | 3:01.10 min |
$^1$: Did not finish in the final.