Teenage sprint sensation Dina Asher-Smith has been crowned World Junior Champion after a blistering performance in Oregon in the early hours of Thursday.

The Blackheath & Bromley star, 18, who was voted captain of the Great Britain & Northern Ireland squad by her peers earlier this week, recorded her first major 100m victory at Hayward Field, Eugene, having been crowned European Junior 200m champion last year.

The Orpington ace was seventh in the 200m at the last World junior Championships in Barcelona two years ago, an event where clubmate Adam Gemili claimed the 100m title.

On Tuesday night Asher-Smith ran 11.18secs to qualify fastest from the heats and on Wednesday evening ran 11.31 into a strong headwind to win the second semi-final.

In the early hours of Thursday Asher-Smith won the final in 11.23secs, almost a fifth of a second clear of the field, with British teammate Desiree Henry – one of the London 2012 Olympic Torch lighters – finishing fourth.

She said: "I was ecstatic. I don’t normally celebrate but I just threw my arms in the air."

Asher-Smith – who claimed bronze in the 4x100m at the senior World Championships in Moscow last August - will run the 200m at the European Championships in Zurich next month.