Carl Hester gave Great Britain a strong start today in their quest for a first Olympic dressage medal.
The 45-year-old, who is riding in his fourth Olympics, scored 77.72% on Uthopia, the highest score of the opening seven-rider session at Greenwich Park.
He was joined at the top of the leader board by Britain's Laura Bechtolsheimer, who is currently in second place after scoring 76.839%.
Britain are the reigning European team champions, and their trio of Hester, Bechtolsheimer and Charlotte Dujardin have an outstanding chance of Olympic gold.
Sir Chris Hoy rode to glory as he took an historic fifth Olympic title on a golden day for Britain.
Despite having no passport and no country, a marathon runner who fled to avoid a Sudanese child labour camp will run at the Olympics.
Chris Hoy and Victoria Pendleton will try and keep up the cycling winning streak, with Rebecca Adlington defending her 800m Beijing title