LOS ANGELES: It is the perfect scenario for Olympic and world champion Jeremy Wariner, a breathtaking image that he has contemplated countless times.

The date is Aug 21 and he is thundering toward the finish line of the men's 400m final at the Beijing Games, roared on by a capacity crowd of 91,000 in the Bird's Nest National Stadium.

Leaving his closest challengers trailing in his wake, the 24-year-old American retains the gold by breaking the world record held by his manager and mentor Michael Johnson.

Jeremy Wariner of the US celebrates his victory in the men's 400m during the Paris Golden League meeting at the Stade de France in Saint Denis near Paris July 18, 2008. [Agencies]

"I think about it all the time," said Wariner, who has dominated the 400 for the last four years. "I would love to break the record on the world's biggest stage, knowing millions of people are watching and that memories will be made.

"A lot of people still talk about Michael's 200 in 1996. If I break the world record in Beijing, I would want them to remember it in the same way."

Johnson shattered his own world record for the 200m with a stunning time of 19.32sec at the 1996 Atlanta Games. That mark still stands.

His 400m world record of 43.18 was set at the 1999 world championships in Seville. Now, he has been doing his best over the last four years to help Wariner go faster.

"The way Michael looks at it, he knows records are meant to be broken," said Wariner, who wears wrap-around sunglasses when he runs to block out any possible distractions.

"With my talent, the way I train and how dedicated I am in that training, he knows I can break it.

"If everything comes together in the right way and I run the perfect race, the shot will be there to break the record. I have the potential to do it and I have the heart to do it. I just have to put everything together at the right time."

Although Wariner has been the dominant figure over 400m for the last four years, he has been pushed hard this season by fellow American LaShawn Merritt.

Wariner was beaten twice by Merritt, including at the United States Olympic trials, before gaining sweet revenge with a win in Rome and a commanding victory at the Paris Golden league meeting on July 18.

"I ran a lot better and made a statement going into the Olympics," Wariner said after powering home in 43.86, the fastest time in the world this year. Merritt had to settle for second place in 44.35.

"This is a pretty good way to get ready for the Olympics," added Wariner, whose personal best was 43.45, set when he retained his world title in Osaka last September.

Wariner continues to seek advice from Johnson while being coached by Michael Ford, who this year replaced Clyde Hart as his trainer.

"Michael has never coached me," Wariner said of his mentor. "He has just given me advice on what he sees in my race. He will talk to my coach about it and they will both agree on what I need to work on.

"They will then come to me and let me know what they both saw and we will go from there. Michael has meant a lot to me in my life, just being able to ask him questions on all sorts of different things."

Perhaps the best advice Wariner has received from Johnson was to get into the minds of his rivals as an invincible runner.

"Michael has always told me that, when I run, I've got to put it out there that I am number one and no one is going to beat me," he said.

"Just let them know that, on any given day, it's going to be hard to beat me."