LONDON, England (BBC) – Simeon Williamson left Dwain Chambers and the rest of the field trailing to win the men’s 100-metre final at the World Trials and UK Championships. The 23-year-old crossed the finishing line in an impressive 10.05 seconds to book his Great Britain place at August’s World Championships in Berlin.

“I’m not surprised. My season’s best is 10.09 and I expected it,” he said.

Olympic champion Christine Ohuruogu won the 400m and Kate Dennison set a new national record in the pole vault.

It was a stunning victory for Williamson, who has spent the last two years in the shadow of Chambers but has steadily improved under the guidance of coach Lloyd Cowan and undergone extensive “groundwork” in Jamaica.

After being overlooked for the World Championships in 2007, Williamson has now guaranteed his spot on the plane to Berlin, with the team named on July 28.

He also has the chance to go up against Olympic champion Usain Bolt at Crystal Palace in two weeks.

“Usain’s my next big opposition,” the former World Under-23 champion added. “I’ve just got to go out and put in a good performance in Germany. Hopefully I won’t get injured like I did at the Beijing Olympics.

“I would have liked to run a sub-10 seconds. I know I’m in shape but that’s the next goal for me.

“It was all about booking my place for the Worlds. A medal is a possibility – if you make the final, anything is possible.”

The signs were there in the semi-finals when Williamson ran the fastest in 10.15, and in the final he even had to overcome a warning for not settling early enough.

Chambers who is also running in the 200-metre this weekend, trailed by 0.17 seconds, with Tyrone Edgar (10.28) and Craig Pickering (10.33) close behind.

“I’ll get him back,” Chambers, the world indoor champion, said. “I don’t want to make excuses. It’s unusual to be beaten but I’ve been complacent this year. I haven’t had to fight for anything and now I do.

“Just because I’ve had a glitch I am not going to stop. I have had to deal with worse. The loss will give me that extra buzz to get back.

“Simeon’s always wanted to beat me but he’s not doing it again. I’ve got work to do and I’ll bounce back.”

Elsewhere, Ohuruogu, who only decided last week against competing in the 200-metre, recovered from a sluggish start to win the 400m final.

A time of 51.26 was good enough to see off rising 20-year-old star Perri Shakes Drayton (51.81) and Kim Wall.

After a disappointing sixth in Oslo last weekend in only her second 400-metre of the season, Ohuruogu was satisfied with her progress as she prepares for another duel with American Sanya Richards in Berlin.

“If I compare my progression to last year it’s pretty much the same,” the 25-year-old Olympic champion said.

“Every championship I need to do a few races to get my legs going. I always say ‘get me to the line fit and healthy’ and I’ll be there.

All I can do now is go back home and train well and hope that when I get to the Worlds I’ll be ready.”

Elsewhere, Dennison edged out Henrietta Paxton to win $5 000 and become national pole vault champion with a leap of 4.57 metres.

Germaine Mason beat off Samson Oni and last year’s winner Tom Parsons to win the high jump with 2.24 metres – 7cm short of the World Championships qualifying mark.

Conrad Williams was the fastest qualifier for today’s 400-metre final in 45.83, ahead of Rob Tobin and Michael Bingham, while Marilyn Okoro impressed in the 800m, along with Claire Gibson, Jenny Meadows and Jemma Simpson.