Instagram@Rio: Day 4

American swimmer Michael Phelps with his team after winning the 4x800m freestyle relay.

Singapore's badminton player Derek Wong on Singapore's 51st birthday.

https://www.instagram.com/p/BI4oO6NDNj8/

American gymnast Simone Biles together with her team.

Swiss cyclist Fabian Cancellara celebrates his victory in the road cycling men's time trial.

Men's 100m freestyle champion Australian Kyle Chalmers celebrates his win.

Tennis player Eugenie Bouchard gets a feel of the diving boards.

Australian hurdler Michelle Jenneke takes some time out for a Coke.

Swimmer "Iron Lady" Katinka Hosszu enjoys her gold medals.

Get to know all of Team SG's athletes in Rio with ST's interactive guide.

Follow ST's microsite till Aug 21 when the Olympics end: http://str.sg/olympics