Dina Asher-Smith dominated the women’s 200m final at the World Athletics Championships in Doha to win gold and seal her first global title.

Asher-Smith, who won silver in the 100m on Monday, came off the bend in the lead and extended her advantage down the home straight to cross the line in a British record of 21.88sec.

The 23-year-old British sprinter had been the favourite coming into the race after her most high-profile rivals dropped out through injury, fatigue or disqualification.

But neither the added expectations nor her exertions in the 100m weighed Asher-Smith down as she cruised to a huge margin of victory over American Brittany Brown, who won silver, and Switzerland’s Mujinga Kambundji, who took bronze.

“I don’t know what to say, I don’t think it’s properly sunk in,” Asher-Smith said immediately after the race. ”Jon [Blackie, her coach] and I knew I could do it. I woke up today thinking ‘this is it. This is the moment you did all your work for’. The tiredness disappeared.”

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She added: “All the support means so much. For my mum, my dad and his wife to be here, it means so much. I’m lost for words. I dreamt of this and now it’s real.”

Dina Asher-Smith crosses the line to win gold (Reuters)