Berlin  - Usain Bolt aims to complete a golden treble at the world championships on Saturday like he did at the Olympics last year, with a little help of his teammates.

The 4x100 metres relay final is top of the agenda on the penultimate day of the competition. The Jamaicans enter the event as top favourites.

However, Bolt and company will run into the US, which has won every relay final at the world championships it completed.

The 100m silver medallist Tyson Gay rested for the 200m and aims to help the US salvage some sprint pride. The US dropped the baton in the Olympic heats and has something to make up for, with coach Harvey Glance saying the main work was on the mental side.

"We know that we have fast runners. Our main aim is to get the stick around," said Glance.

That's what the Jamaicans must also achieve if Bolt is to become the third man at world championships to get the treble, following Maurice Greene in 1999 and Gay in 2007.

Bolt redefined the sprint yet again in Berlin with amazing world records of 9.58 and 19.19 seconds in the 100m and 200m, respectively.

If the Jamaicans win with another world record (they ran 37.10 at the Beijing games), Bolt would be a perfect 6-0 for sprint finals and world records at worlds and Olympics.

"I am ready for another world record with the relay," said Bolt.

The women's relay is also expected to be a duel between the Jamaicans and Americans, although both dropped the stick at the Olympics, letting Russia take the gold.

The other five finals are men's marathon, pole vault and long jump, and the women's 5,000m and hammer throw.

The marathon in downtown Berlin takes place without world record holder Haile Gebrselassie and Olympic champion Samuel Wanjiru of Kenya, who prefer to run in lucrative city races later in the year.

Two-time world champion Jaouad Gharib of Morocco hopes to have the last laugh again in what has been billed a duel between Kenya and Ethiopia, with Kenya's four-time Boston winner Robert Cheruiyot the most successful man.

American title holder Brad Walker withdrew injured from the pole vault and Olympic champion Steve Hooker of Australia is nursing a hamstring problem. That could help French sensation Renaud Lavillenie, the season leader with 6.01m.

In the long jump, world and Olympic champion Irving Saladino of Panama and the 2003 and 2005 world champion Dwight Phillips are set to battle out the gold.

The long jump medals will be presented by Marlene Dortch, the granddaughter of Jesse Owens and Kai Long, the son of Owens' friendly rival Luz Long. Long famously gave advice to Owens, who then completed his four-gold haul at the politically charged 1936 Olympics.

Holder Meseret Defar leads an Ethiopian charge in the 5,000m and Betty Heidler also looks to retain her hammer throw title from 2007 in front of a home crowd. (dpa)