Berlin - A year after her controversial victory, world 800m champion Caster Semenya will be back at Berlin's Olympic Stadium on Sunday as she rebuilds her career after her sex test ordeal.

Semenya has been at the centre of a storm ever since she won the world title last August in Berlin in a personal best time, but will be taking part in Sunday's IAAF World Challenge in Germany's capital.

Controversy has surrounded Semenya since she become world champion, but was then barred from running soon after as the world governing body ordered a sex test and enquiry into her unusually high levels of testosterone.

Last month, she was given the all-clear to resume her career with her first major test set to come at October's Commonwealth Games in India.

She has only been allowed to compete since July 6 and after returning in Finland with times of two minutes 04.22 seconds and 2:02.41, she hopes to keep improving in Berlin.

"I have now run at two meets in Finland and won them both," she said.

"But I cannot be completely satisfied with my times.

"Still, after 11 really hard months in which I’ve been through a lot, I’m looking forward to being on the track once again.

"Now I have to see to it that I really run good races, so as to pick up the thread of my earlier achievements - maybe this time in Berlin."

Her main rivals over the 800m will be Lenka Masna of the Czech Republic and Elisa Cusma of Italy.

Despite not being part of the IAAF's Diamond League programme, the Berlin event has still attracted several world champions in Polish hammer-throw Anita Wlodraczyk, Germany's discus-giant Robert Harting and Semenya.

Germany's European champion Verena Sailer will have a tough battle in the 100m against Kelly Ann Baptiste of Trinidad, Sherone Simpson of Jamaica, France's Christina Arron and Debbie Ferguson of the Bahamas, who have all run under 11 seconds.

Local heroine Ariane Friedrich is set to be up against her arch-rival and world champion Blanka Vlasic in the women's high jump after the German took bronze while Croatia's Vlasic won gold at the European Championships.

In the men's pole-vault, Australia's world champion Steven Hooker will be competing against German rivals Malte Mohr and Raphael Holzdeppe.

World indoor champion Lolo Jones of the United States will be the name to beat in the women's 100m hurdles.