LONDRES (AP) — Uno sacó el pie del acelerador después de la mitad de la carrera. El otro se frenó tanto que casi lo alcanzan sus perseguidores. No cabe duda que Usain Bolt y Yohan Blake a media máquina son infinitamente superiores al resto.

Con pasmosa facilidad, Bolt y Blake ganaron el miércoles sus series semifinales de los 200 metros en los Juegos Olímpicos y confirmaron que la final del jueves es un asunto que les concierne únicamente a ellos.

Bolt cronometró 20.18 casi trotando y Blake marcó 20.01 en una serie en la que disminuyó tanto la velocidad que por poco lo alcanzan Wallace Spearmon y Christophe Lamaitre.

"Lo importante es avanzar con la mayor facilidad posible. Estoy listo, esta es mi carrera favorita", advirtió Bolt, quien busca convertirse en el primer atleta que revalida los títulos olímpicos de los 100 y 200 metros.

"Esa carrera fue como un paseo en el parque", coincidió Blake.

La jornada le dejó un sinsabor a Dayron Robles, el campeón de los 110 metros con vallas en Beijing que no pudo revalidar su título en Londres. El cubano ni siquiera pudo terminar la final, al abandonar la carrera después de saltar la sexta valla y agarrarse la corva derecha.

El estadounidense Aries Merritt se colgó el oro con tiempo de 12.92 segundos, apenas una centésima por encima del récord olímpico del chino Liu Xiang, quien abandonó en las preliminares por una lesión en el tendón de Aquiles.

El estadounidense Jason Richardson cruzó la meta segundo y el jamaiquino Hansle Parchment fue tercero.

Allyson Felix, tres veces campeona mundial de los 200 metros, finalmente conquistó el oro olímpico en la distancia, luego de haber terminado segunda en Beijing 2008 y Atenas 2004.

La estadounidense detuvo el reloj en 21.88 segundos, para superar por 21 centésimas a la jamaiquina Shelly-Ann Fraser-Pryce. La estadounidense Carmelita Jeter se llevó el bronce.

"Pensé en la desilusión que tuve en Beijing. Ha sido un camino largo, pero nunca me rendí", señaló Felix. "Ha sido toda una epopeya, nunca fácil, pero no puedes perder de vista tu sueño. Es increíble, lo quería desde hace mucho tiempo. Este momento es incalculable".

En la pista del Estadio Olímpico también debutó Caster Semenya, quien hace tres años tuvo que someterse a pruebas de corroboración de género, y la sudafricana sorteó sin muchos problemas las eliminatorias de los 800 metros.

La corredora sudafricana estuvo sin competir casi un año mientras las autoridades del atletismo decidían si la dejaban inscribirse en justas tras conquistar el título del Mundial de 2009, a sus 18 años. Tras recibir el aval, Semneya quedó segunda en el Mundial del año pasado.

Además, Sarah Attar se convirtió en la primera mujer saudí que compite en una prueba de atletismo en los Juegos Olímpicos, y fue eliminada en las preliminares de los 800 metros. Attar corrió con la cabeza cubierta con una pañoleta blanca, camiseta verde de mangas largas y mallas negras.

En las otras finales, la rusa Natalya Antyukh ganó los 400 metros con vallas y la estadounidense Brittney Reese se impuso en el salto largo.

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  • Usain Bolt

    Jamaican Olympic gold medallist Usain Bolt, right, runs to win the "Mano a Mano" Men's 150m challenge on Copacabana beach in Rio de Janeiro, Brazil, Sunday, March 31, 2013. Bolt defeated Antigua and Barbuda's Daniel Bailey, left, Ecuador's Alex Quinones, third from left, and Brazil's Bruno Lins de Barros on a 150m track specially built at the famous beach. (AP Photo/Felipe Dana)

  • Usain Bolt

    Jamaican Olympic gold medallist Usain Bolt runs to win the "Mano a Mano" Men's 150m challenge on Copacabana beach in Rio de Janeiro, Brazil, Sunday, March 31, 2013. Bolt defeated Antigua and Barbuda's Daniel Bailey, Ecuador's Alex Quinones and Brazil's Bruno Lins de Barros on a 150m track specially built at the famous beach. (AP Photo/Felipe Dana)

  • Usain Bolt

    Jamaican Olympic gold medallist Usain Bolt runs to win the "Mano a Mano" Men's 150m challenge on Copacabana beach in Rio de Janeiro, Brazil, Sunday, March 31, 2013. Bolt defeated Antigua and Barbuda's Daniel Bailey, Ecuador's Alex Quinones and Brazil's Bruno Lins de Barros on a 150m track specially built at the famous beach. (AP Photo/Felipe Dana)

  • Usain Bolt

    Jamaican Olympic gold medallist Usain Bolt runs to win the "Mano a Mano" Men's 150m challenge on Copacabana beach in Rio de Janeiro, Brazil, Sunday, March 31, 2013. Bolt defeated Antigua and Barbuda's Daniel Bailey, Ecuador's Alex Quinones and Brazil's Bruno Lins de Barros on a 150m track specially built at the famous beach. (AP Photo/Felipe Dana)

  • Usain Bolt

    Jamaican Olympic gold medallist Usain Bolt runs to win the "Mano a Mano" Men's 150m challenge on Copacabana beach in Rio de Janeiro, Brazil, Sunday, March 31, 2013. Bolt defeated Antigua and Barbuda's Daniel Bailey, Ecuador's Alex Quinones and Brazil's Bruno Lins de Barros on a 150m track specially built at the famous beach. (AP Photo/Felipe Dana)

  • Usain Bolt from Jamaica reacts after winning the men's 200m race at the Diamond League Athletics meeting in Zurich, Switzerland, on Thursday, Aug. 30, 2012. (AP Photo/KEYSTONE,Steffen Schmidt)

  • Usain Bolt from Jamaica reacts after winning the men's 200m race at the Diamond League Athletics meeting in Zurich, Switzerland, on Thursday, Aug. 30, 2012. (AP Photo/KEYSTONE,Walter Bieri)

  • Usain Bolt from Jamaica celebrates after winning the men's 200m race at the Diamond League Athletics meeting in Zurich, Switzerland, on Thursday, Aug. 30, 2012. (AP Photo/KEYSTONE,Alessandro della Bella)

  • Jamaica's Usain Bolt wins the finals of the men's 200-meter in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Morry Gash)

  • Jamaica's Usain Bolt celebrates as he crosses the finish line to win the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Anja Niedringhaus)

  • Jamaica's Usain Bolt second left, reacts as he crosses the finish line to win the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Anja Niedringhaus)

  • Jamaica's Usain Bolt, third left, reacts as he crosses the finish line to win the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Martin Meissner)

  • Jamaica's Usain Bolt, left, gestures after crossing the finish line to win gold ahead of silver medallist Yohan Blake of Jamaica, center, and bronze medallist Warren Weir of Jamaica in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/David J. Phillip)

  • Jamaica's Usain Bolt celebrates as he crosses the finish line to win the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. (AP Photo/Martin Meissner)

  • Jamaica's Usain Bolt, center, Jamaica's Yohan Blake, left, and Jamaica's Warren Weir celebrate their medals in the men's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Thursday, Aug. 9, 2012. Bolt won gold, Blake silver and Weir bronze. (AP Photo/David J. Phillip)

  • Jamaica's Usain Bolt competes in a men's 200-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Ben Curtis)

  • Jamaica's Usain Bolt competes in a men's 200-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/David J. Phillip)

  • Jamaica's Usain Bolt competes in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Matt Dunham)

  • Jamaica's Usain Bolt, center, leads in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Martin Meissner)

  • Jamaica's Usain Bolt, second left, competes in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Daniel Ochoa De Olza)

  • Jamaica's Usain Bolt competes in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Lee Jin-man)

  • From left, Jamaica's Usain Bolt, United States' Isiah Young, Switzerland's Alex Wilson and Cuba's Michael Herrera compete in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Lee Jin-man)

  • From left, Jamaica's Usain Bolt, United States' Isiah Young, Switzerland's Alex Wilson and Cuba's Michael Herrera compete in a men's 200-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Tuesday, Aug. 7, 2012. (AP Photo/Lee Jin-man)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica celebrates winning gold in the Mens 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Stu Forster/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Ryan Bailey of the United States, Usain Bolt of Jamaica, Justin Gatlin of the United States, Yohan Blake of Jamaica, Tyson Gay of the United States, Asafa Powell of Jamaica in the Mens 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Alex Livesey/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica crosses he line to win gold in the Mens 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Jamie Squire/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica celebrates after crossing the finish line to win the gold medal in the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Cameron Spencer/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Gold medalist Usain Bolt of Jamaica hugs bronze medalist Justin Gatlin of the United States after winning the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Cameron Spencer/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica crosses the finish line ahead of Yohan Blake of Jamaica and Justin Gatlin of the United States to win the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Cameron Spencer/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica celebrates after crossing the finish line to win the gold medal in the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Jeff J Mitchell/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica crosses the finish line ahead of Ryan Bailey of the United States, Yohan Blake of Jamaica and Justin Gatlin of the United States to win the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Richard Heathcote/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica competes in the Men's 100m Semi Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Alexander Hassenstein/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica leads the pack during the Men's 100m Semifinal on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Phil Walter/Getty Images)

  • Olympics Day 9 - Athletics

    LONDON, ENGLAND - AUGUST 05: Usain Bolt of Jamaica leaves the starters block during the Men's 100m Semifinal on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England. (Photo by Ian Walton/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: Usain Bolt of Jamaica looks on duing the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Streeter Lecka/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: (L-R) Usain Bolt of Jamaica and James Dasaolu of Great Britain compete in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Stu Forster/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: (L-R) Usain Bolt of Jamaica and James Dasaolu of Great Britain compete in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Stu Forster/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: Usain Bolt of Jamaica and James Dasaolu of Great Britain compete in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Paul Gilham/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: Usain Bolt of Jamaica competes in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Stu Forster/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: Usain Bolt of Jamaica competes in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Michael Steele/Getty Images)

  • Olympics Day 8 - Athletics

    LONDON, ENGLAND - AUGUST 04: Usain Bolt of Jamaica competes in the Men's 100m Round 1 Heats on Day 8 of the London 2012 Olympic Games at Olympic Stadium on August 4, 2012 in London, England. (Photo by Michael Steele/Getty Images)

  • Jamaica's Usain Bolt throws the baton into the air as he celebrates winning the Men's 4x100 Relay final and setting a world record at the World Athletics Championships in Daegu, South Korea, Sunday, Sept. 4, 2011. (AP Photo/Shuji Kajiyama)

  • FILE - This Sept. 4, 2011 file photo shows Jamaica's Usain Bolt posing on the podium after the Jamaican team won the gold and set a new world record in the men's 4x100m relay final at the World Athletics Championships in Daegu, South Korea. Any talk of the Olympics has to start with the flashy Jamaican sprinter. His performance in Beijing four years ago was magical. (AP Photo/Martin Meissner, FIle)

  • World-record holder Usain Bolt talks to journalists after loosing to fellow country man Yohan Blake in the 200m final at Jamaica's Olympic trials in Kingston, Jamaica, Sunday, July 1, 2012. Blake edged Bolt by 0.03 finishing in 19.80 seconds. (AP Photo/Collin Reid)

  • World-record holder Usain Bolt looks at the crowd while getting his right hamstring stretched out after loosing to fellow country man Yohan Blake in the 200m final at Jamaica's Olympic trials in Kingston, Jamaica, Sunday, July 1, 2012. Blake edged Bolt by 0.03 finishing in 19.80 seconds. (AP Photo/Collin Reid)

  • World champion Yohan Blake, right, is congratulated by world-record holder Usain Bolt after Blake defeated Bolt in the 100m final at Jamaica's Olympic trials in Kingston, Jamaica, Friday, June 29, 2012. Blake pulled a stunner finishing in 9.75 seconds to upset Bolt by 0.11 seconds. (AP Photo/Collin Reid)

  • Usain Bolt wax figure unveiled

    Air crew walk past the wax figure of Usain Bolt, as passengers arrive at London's Heathrow Airport Terminal 5, greeted by the wax figure, Thursday July 12, 2012. The wax figure of Jamaican sprinter Usain Bolt, adopting his signature pose, was officially unveiled Thursday at the airport before it goes on display at the Madame Tussauds attraction in central London on Monday July 23. Many sporting themes are decorating the cities as the country prepares for the upcoming London 2012 Olympic Games. (AP Photo / Steve Parsons, PA) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES