BERLIN -- Teeth clenched, Usain Bolt grimaced as he churned toward the finish line, hoping to coax a fraction more out of his 6-foot-5 frame.

The big, yellow numbers flashing another world record time, told the Jamaican sprinter he had gotten what he wanted out of the 200 meters Thursday at the world championships.

Beyond the mark of 19.19 seconds, though, was something else -- the fact that he is altering his sport.

For the second straight race -- five, if his record-breaking runs at the Beijing Olympics are counted -- Bolt's biggest competitor was the clock. He bettered his old world record by a whopping .11 seconds, the same margin he shaved off the 100 four days earlier, when he finished in 9.58. Usain Bolt broke his own record in the 200 meters by 0.11 seconds on Thursday. Andy Lyons/Getty Images

"I'm on my way to being a legend," Bolt said, without a trace of arrogance.

No debate there.

He is erasing chunks of time from records that normally take years to break. He is beating the so-called competition by body lengths -- this time, Alonso Edward of Panama was 0.62 seconds behind -- in a sport often decided by photo finishes.

"He's a gift to this earth," said American sprinter Shawn Crawford, who finished fourth. "He's a blessing to the track game. ... I'm just waiting for the lights to flash 'game over,' 'cause I felt like I was in a video game."

Bolt can't be caught, even when he gives away tips. Just before the start of the race, Bolt told good friend Wallace Spearmon to stay close to him on the curve and follow him home.

The American tried.

"Even if I run the best turn of my life, I'm still going to be behind," said Spearmon, who finished with the bronze. "I knew what was in store for the race. I expected it to be at least that fast."

When he saw his record time, Bolt pointed at the display, then stuck out his tongue in his best Michael Jordan impersonation.

"Even us in the field, we think there is going to be something phenomenal from him," Crawford said.

Bolt feeds off the energy from the crowd. The louder they get, the more playful he becomes.

He showed up at the start wearing a T-shirt with a new take on President John F. Kennedy's famous Cold War quote "Ich bin ein Berliner."

This time, the slogan said, "Ich bin ein Berlino," a reference to the bear mascot of the championships.

The audience ate it up, along with Bolt's hand gestures and other assorted antics.

Then it was time to go to work in his yam-colored Pumas. He jetted out of the blocks, turned the corner and it was over.

No one was going to catch him once he reached the straightaway.

"I was surprised with myself that I did so well," Bolt said.

After that, came his favorite part -- the celebration. He involved just about everyone as he made his way around the track, stopping to sign autographs for kids, mugging for pictures and posing with Berlino, who joined Bolt in the sprinter's signature bow-and-arrow stance.

Midway around the track, Bolt took off his shoes and carried them.

"I was so tight, I couldn't even really jog. I was just tired," said Bolt, who celebrates his 23rd birthday Friday.

So how low can Bolt go? Even he has no clue.

"I keep saying anything's possible as long as you put your mind to it," he said.

Former sprint star Michael Johnson, whose record of 19.32 stood for 12 years before Bolt broke it last year, believes the 19-second barrier might be next.

"He could," Johnson said. "He's very tall and has an extremely long stride. He's not the only person in the world that's 6-foot-5, he's just the only one that's 6-5 and that fast."

Before the race, Johnson said he didn't think Bolt would break the mark. Not today. Not with his top rival, Tyson Gay, on the sideline with a groin injury.

But he also threw in a qualifier.

"Anytime Usain Bolt steps on the track, a world record is possible," Johnson said.

In other finals:

• Trey Hardee won the decathlon, edging Leonel Suarez of Cuba. He joins Americans Dan O'Brien, Tom Pappas and Bryan Clay as decathlon winners at world championships.

• Lashinda Demus of the U.S. captured the silver in the 400 hurdles.

• Americans Terrence Trammell and David Payne took advantage of Dayron Robles' absence in the 110 hurdles finals to finish second and third, respectively. Robles, the Olympic champion from Cuba, hurt his hamstring in the semifinal round.

• Blanka Vlasic of Croatia defended her title in the high jump.

But the stage belonged to Bolt, and that's where he shines.

For a warmup act, he comically threw a roundhouse punch at Spearmon and hammed it up for the camera.

For the performance, he blistered the field.

For the finale, he broke another world record.

Not bad theater.

"Insane Bolt," Spearmon said. "That's what we call him."

Bolt overheard that remark.

"Yo, Spearmon," Bolt yelled from across the room. "Don't call me insane, man. I heard you called me insane. What's up with that?"

As a way to describe how Bolt is tearing up the track, there may be no better word.