The rest of the world says it's ready to take on Bryan Clay.

And so the battle lines are drawn for the men's decathlon event at the 11th World Championships of Track and Field at Nagai Stadium.

Hawaii's Clay, 27, a Castle High School and Azusa Pacific University of California graduate, is cast in the role of defending champion in the 10-event struggle, which opens with the 100-meter dash Friday morning and concludes with the 1,500-meter run Saturday night.

He scored the biggest triumph of his life when he rolled up an 8,732-point score in brutal rainy, cold conditions to take the gold medal at the 2005 World Championships in Helsinki.

But some have pointed to his failures to finish at both the 2006 and 2007 USA Championships in Indianapolis as reason to doubt his full fitness for a World title defense.

There are some high-level doubters that Clay can win it again, including Track and Field News, the California-based magazine that calls itself "the bible of the sport."

"Track and Field News didn't even have me in the medal count, and I'm not sure why," Clay said in a recent press conference.

"I've been the underdog many times," he added.

"So, for me, this is usually the position that I'm in, and it was the same in Athens (where he took the silver medal at the 2004 Olympic Games.)

"And I don't think there were many who I thought I'd do well in Helsinki, either.

"It's a familiar position for me and where I like to be.

"I like to know that I'm the underdog and then go out and show everybody that I can do well."

Another expert analyst, Bob Ramsak, writing for the International Association of Athletics Federations, the global governing body for the sport, said "Bryan Clay will have his hands full."

Some familiar names will be arrayed against Clay.

Heading the list is Roman Seberle of the Czech Republic, who took the 2004 Olympic gold medal and set the world record of 9,026 points in 2001.

There's Tom Pappas, Clay's USA teammate, the man who was favored to win heading into the 2004 Athens Games but exited after seven events when a foot injury knocked him out of the pole vault.

There's Tomas Dvorak, another veteran Czech, who took gold medals at three previous editions of the Worlds (1997-1999-2001) and an Olympic bronze back at the Atlanta Games of 1996.

And there are such all-around talents as Andre Krauchkuna of Belarus, who scored 8,697 points to beat both Seberle and Clay in the big Gotzis, Austria meet in late May, and Dmitry Karpov of Kazakhstan, the 2004 Olympic bronze medalist who has an 8,553 score this year.

Only a bad day in the discus circle ruined Clay's hopes of running up a huge score in Gotzis and he still totaled 8,493 points.

Usually, his performances in the shot put, discus and javelin have been his strongest points, despite his 5-foot-11, 185-pound physique.

Many of his leading rivals tower over him but he's never let that worry him as he's climbed to the top of his event with a combination of great strength, superb technique and total dedication.

Just five men have ever scored more than Clay's career-best total of 8,820 points taking the Olympic silver at Athens in 2004. Those above him are Seberle (9,026), Dvorak (8,994), American record-holder Dan O'Brien (8,891), Great Britain's Daley Thompson (8,847) and Germany's Jurgen Hingsen (8,832.)