Holder, will go in lane 5. Carina Paim of Portugal won silver in the Europeans behind Shuliar in June. Toyama Aimi. And the Malaysian will go in lane 2, Ariffin. Tack bronze in 2015. At the world's in Doha. Intellectual impairment category. The rain buckets down here at the Tokyo Paralympic stadium. The contrast to what has been in the past few days indeed. Gonzalez Henriques in 9. The officials have asked them to stand up and adjust. It's a bit difficult at the moment because the rain is coming down and you can see Breanna Clark, looking a bit cold almost in the rain. The officials have got together and are working out what the problem is. The Japanese athlete out there in lane 3. Not pleasant to be standing there in these conditions. >> At least it's still relatively warm and the athletes will be in the same position. Not particularly pleasant. They'll have done a thorough warm-up. The officials have ushered away some photographers who were getting a bit close to the inside of the track. So we have a reset. Green card shown, no issues, and we are back to having eight to start again. The women's 400m intellectual impairment category. It's Breanna Clark of the United States who has got away very quickly indeed. She was shivering in the rain there beforehand and she's flown past one of the other runners. The double world champion leads at the present time as they move around into the last 100 or so metres and looking good on the outside as well is the Ukrainian European champion Yulia Shuliar as they straighten up with 100m to go. Clark leads it from Shuliar out wide. Clark is about five or 10 metres out in front, holding her rhythm and her position, and Clark is going to defend the title she won back in 2016 in a new world record time of 55:19 seconds. Shuliar tried to get to her. Pure joy for Breanna Clark, look at that dancing! What moves she's got and a gold medal to boot. Brilliant to see. Pure emotion, pure will to win. Pure genius. Breanna Clark. She's a double world champion. She's now a double Paralympic champion, Shuliar did her best. And it was Brazil who picked up the bronze medal, 17 years of age. Barbosa, the silver, in her first major Championships finished behind that lady there and her. World record for Breanna Clark, 55:18. A European record for Yulia Shuliar taking silver and a lifetime best for Barbosa and da Silva taking the bronze. >> What a gutsy race. She went out hard and it looked as though she could have gone a little too hard. She absolutely flew past the field on the right hand side and just tying up ever so slightly but to come home and hold on those final few metres and take the world record, as you can see, she doesn't go any further and as soon as the line comes that is enough for her. She did enough not only to win the title but to take the world record. We'll watch again and you see the line comes and she's decelerating with the teeth gritted. What a performance. That will have been worth any of those 55 seconds of discomfort. >> 26 years of age from Los Angeles in California. Retaining the title she won in Rio in 2016. And looks strong. She flew past Shuliar on the outside. Went past the Pole, Franiczcek and from there she was never caught. Confirmation of the world record.