World champions Faith Chepngetich and Hellen Obiri will headline the 10th stop of the IAAF Diamond League in London today and tomorrow which has attracted 20 reigning world and 10 reigning Olympic champions.
Chepngetich, the 2016 Olympic and 2017 world champion, made her eagerly anticipated return from maternity leave with a 3:59.04 victory over 1,500m at the Prefontaine Classic three weeks ago.