Last update on. From the section OlympicsTokyo Olympic Games on BBC Dates: 23 Jul-8 Aug Time in Tokyo: BST+8. Listen live on BBC TV, BBC iPlayer and BBC Red Button; Listen live on BBC Radio 5 Live, Sports Extra, and Sounds; Live text and video clips available on BBC Sport app and website.Dina Asher Smith, the world champion for Great Britain, has pulled out from the Olympic 200m. She revealed that she had tore her hamstring in early March.After running 11.05 seconds in her semi final on Saturday, the 25-year old suffered an injury at the British Championships and was unable to run in the 100m final in Tokyo.BBC Sport was brokenhearted when Asher-Smith said, "It broke mine heart because I am a rival." Although it is the Olympics, there are many other championships that I can compete in.After suffering an injury in her 100m national title victory in Manchester, the world 200m champion claimed she was in the "best shape of her life".After receiving a second opinion from a doctor on the severity of her tear, she decided to travel to Tokyo to try to win.She said in an emotional TV interview that she was so grateful for the support of everyone who helped her get to the track and race tonight.Although I wasn't my normal self, it was a great journey and I'm proud of myself. It was frustrating because I was in control of my own life."If you asked me six weeks back, I would have said that I was certain I would win the whole thing."I knew every aspect of my race, from my start to my transition and my finish. They were faster than any of the fastest women around the world."I will pull out, and that would be the one as reigning world champ - you know that Olympic champion doesn't seem like a big step.It doesn't affect my ability as an athlete. I know that I need to continue power training and endurance for a few weeks more to make that happen.Asher-Smith will face tougher competition in the Olympic 200m that she faced in Doha two year ago.American Gabrielle Thomas ran fastest 200m since Florence Griffith Joyner, the legendary world record holder, at the US trials earlier in the year. Shaunae Miller Uibo from Jamaica and Shelly-Ann Fraser -Pryce of Jamaica, who were not in the world finals, also competed.
