Some of the world's biggest names in swimming and athletics battle for the podium on a remarkable night of Olympic sport as Britain go for gold in the pool and on the track. All eyes will be on the women's 100m, one of five athletics finals, with Great Britain's Dina Asher-Smith set to take on Jamaica's Shelly-Ann Fraser-Pryce and American Sha'Carri Richardson. There are also four gold medals to be decided in the pool, with Team GB seeking to defend their Olympic title in the mixed 4x100m medley relay. There are likely to be fireworks in the men's 100m butterfly as reigning champion Caeleb Dressel attempts to hold onto his crown, while the women's 800m freestyle, featuring Katie Ledecky against Ariarne Titmus, promises to be a race for the ages. Hosted by Clare Balding and Gabby Logan. Key finals 19:30-19:36 Swimming: men's 100m butterfly 19:56-20:02 Swimming: women's 200m individual medley 20:26-20:36 Swimming: 4x100m medley 20:20-20:21 Athletics: women's 100m