Ugandan Halimah Nakaayi shocked the world and favourite Ajee Wilson to win the 800 metres title at the World Championships in Doha.

Wilson was in prime position to win USA's first gold medal in this event, but Nakaayi took full advantage of slight tentativeness from the American to win Uganda's first ever medal at the tournament.

Raevyn Rogers sprinted at the end to take the silver medal to leave Wilson with another bronze after achieving the same in London two years ago.

Nakaayi's time of one minute and 58.04 made for a new national record and she celebrated ecstatically at the finish.

Beatrice Chepkoech created a new championship record as she stormed to gold in the 3000 metre steeplechase.

The Kenyan and favourite for the final burst off in world record pace for the opening part of the race and created a gap of at least five seconds between herself and the defending champion Emma Coburn.

Chepkoech understandably slowed down near the end of the race, but she did not stumble at any of the water jumps and maintained her composure to win Kenya's third gold medal in this event since it started in 2005.

German Gesa Felicitas Krause made up two places in the last lap to win bronze and despite Coburn running a personal best she had to settle for silver behind a time of eight minutes and 57.84 seconds from Chepkoech.

In the high jump final Mariya Lasitskene became world champion for the third time but she had to withstand a brilliant effort from 18-year-old Ukrainian Yaroslava Mahuchikh.

Mahuchikh achieved a new junior world record with her exceptional jump of 2.04 metres but retired to see Lasitskene, competing as a neutral athlete, be crowned champion with the same height score.

Lasitskene failed to clear 2.08 metres, a height which only two athletes have cleared in history, but still got the gold medal. American Vashti Cunningham got the bronze medal with a jump of two metres.