Simone Biles lived up to her star billing as the gymnastics dynamo put herself on track for a record five gold medals by winning the all-around title after helping the United States to defend their team title. The 1.45m Texan with a big smile gave a powerful display of gravity-defying tumbling and acrobatics to add the Olympic all-around crown to the three world titles she holds. She is unbeaten in the individual event since 2013. If Biles takes the vault, beam and floor over coming days she will have won more gold at one Games than any other woman, overtaking Soviet gymnast Larissa Latynina (1956), Czech Vera Caslavska (1968) and Romanian Ecaterina Szabo (1984), who have all won four. "I'm pretty sure I'll just go on lockdown at my house. It won't be exactly normal, but we'll make it as normal as possible," she said.