Haile Gebrselassie smashed his own world record at last year's Berlin Marathon [GALLO/GETTY]

Gebrselassie, who won Olympic golds in 1996 and 2000 in the 10,000 and four consecutive world titles over the distance, has set consecutive world records in 2007 and 2008 in Berlin on what is considered the fastest marathon course in the world.

The Ethiopian said ahead of the Berlin marathon that he was running out of aims.

"I have two plans," the 36-year-old said.

"Breaking the world record is one thing and to win the Olympic title (in 2012).

“This is a very important thing for me. I have no other distance, only marathon."

Gebrselassie, who opted not to run the marathon at last year's Beijing Olympics because of concerns about pollution, will be 39 by the time the London Games come round.

Berlin challenge

Kenyan Duncan Kibet will give Gebrselassie a stiff challenge on Sunday after becoming the second-fastest marathon runner, clocking a time that was only 28 seconds off the Ethiopian's world record of 2 hours 3 minutes 59 seconds.

Gebrselassie said he was not thinking too much about other athletes.

"Since I started marathon, what I found out is that marathon is not like other distances. If you think about only the athletes you miss something.

“In marathon you run against the distance. Not against the competitors," he said.

"My concentration is in the distance itself and not the athletes. Athletes are one thing but the distance is the most important one.

"If you only think about Duncan Kibet, what about the rest.

“We all are doing our best race."

Although he refused to speculate about whether a world record was on the cards, Gebrselassie said the fast Berlin course was always about time.

"Berlin always comes with the time. To win is something but to break the record is special," he said, adding he wanted to run under 61.30 minutes at the halfway mark and then would see if a world record was possible.