Dmytro Zalevsky of Ukraine competes during the Men's 200m backstroke - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Zalevsky won the gold medal in 1 minute 7.81 seconds. (Xinhua/Yang Shiyao)

Lhar Boke of Belarus celebrates after the Men's 100m freestyle - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Boke won the gold medal and set a new world record of 51.91 seconds. (Xinhua/Yang Shiyao)

Kelly Becherer of the United States competes during the Women's 100m freestyle - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Becherer won the gold medal in 59.56 seconds. (Xinhua/Yang Shiyao)

Joanna Mendak of Poland reacts after the Women's 100m butterfly - S12 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Mendak won the gold medal in 1 minute 6.16 seconds. (Xinhua/Yang Shiyao)

Joanna Mendak of Poland reacts after the Women's 100m butterfly - S12 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Mendak won the gold medal in 1 minute 6.16 seconds. (Xinhua/Yang Shiyao)

Joanna Mendak of Poland competes during the Women's 100m butterfly - S12 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Mendak won the gold medal of 1 minute 6.16 seconds. (Xinhua/Yang Shiyao)

Dmytro Zalevsky of Ukraine competes during the Men's 200m backstroke - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Zalevsky won the gold medal in 1 minute 7.81 seconds. (Xinhua/Yang Shiyao)

Akiyama Rina of Japan celebrates after the Women's 200m backstroke - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Akiyama Rina won the gold medal and set a new Paralympic record of 1 minute 19.50 seconds. (Xinhua/Yang Shiyao)

Lhar Boke of Belarus celebrates after the Men's 100m freestyle - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Boke won the gold medal and set a new world record of 51.91 seconds. (Xinhua/Yang Shiyao)

Lhar Boke of Belarus competes during the Men's 100m freestyle - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Boke won the gold medal and set the new world record of 51.91 seconds. (Xinhua/Yang Shiyao)

Kelly Becherer of the United States competes during the Women's 100m freestyle - S11 final at London 2012 Paralympic Games, in London, Britain, on Sept. 2, 2012. Becherer won the gold medal of 59.56 seconds. (Xinhua/Yang Shiyao)