Dina Asher-Smith warns Jamaican and US rivals she will deliver at Olympics

British sprinter unfazed by recent fast times by rivals 'I definitely have faster in me. I'm in good shape' Dina Asher-Smith says she is unfazed by the times run by American and Jamaican sprinters recently, and warned her rivals she is a championship performer who will deliver at the Olympics. Asher-Smith, the reigning 100m silver medallist and 200m world champion, is unbeaten this season but her best times this year - 10.91 and 22.06sec respectively - put her only just inside the top 10 for bot...