Li Jinzhe ranks the fifth place during the Beijing 2015 IAAF World Championships at the National Stadium, August 25, 2015. [Photo/IC] Li Jinzhe, 25 Awards: Gold medal 2014 Incheon Asian games Silver medal 2014 World Indoor Championships Gold medal 2013 IAAF Challenge in Beijing Gold medal 2013 IAAF Shanghai Diamond League

Fabrice Lapierre of Australia finished second in 8.24.

"European champion, Olympic champion and now world champion - it is unbelievable. It is the most incredible thing. I have been dreaming of this day for a long time. I cann't believe I have done this," said the 28-year-old.

Defending champion Aleksandr Menkov of Russia was sixth. Title favorite Jeff Henderson of the United States shed tears after the 22-year-old failed to qualify for the final three rounds.

The men's 800m race saw Rudisha take back the world title in one minute 45.84 seconds. The Kenyan was sidelined with a knee injury for the best part of 2013, forced to forgo his world championships title defence in Moscow.

Poland's Adam Kszczot took silver in 1:46.08 and Amel Tuka of Bosnia and Herzegovina came third in 1:46.30.

Kenya's Nicholas Bett stunned the field to win his country's first 400m hurdles title at the world championships when he clocked 47.79 seconds for the gold. Russian Denis Kudryavtsev came second in 48.05 and Jeffery Gibson from Bahamas was third in 48.17.