Day Two of the Rio Games will feature sports like swimming, women's road cycling, men's fencing, judo and more. Here are some things to watch out for:
The top stars of the tennis world will be in action on Sunday, from World No 1 Novak Djokovic to defending champion Andy Murray, and 22-time Grand Slam champion Serena Williams.
The Americans are heavily favored to repeat their gold medal-winning showing in gymnastics. The real drama will be regarding which of the three US women doing all-round gymnastics — Simone Biles, Gabby Douglas and Aly Raisman — will miss out on the final. Each country can enter just two competitors.
The event will start with 41-year-old Uzbez gymnast Oksana Chusovitina, who will be competing in her seventh Olympics, a record for the sport. Her best chance to make an impact is reaching the vault finals, where she will compete against American Laurie Hernandez, among others. At the time Hernandez, 16, was born, Chusovitina was already competing in her third Olympics in 2000.
Michael Phelps, the most decorated Olympian of all time, will look to add to his record 22 medals. He's expected to be back in the pool on Sunday for the medal round of the men's 4x100 relay. American Katie Ledecky swims in the semi-final of the women's 400m freestyle.
The US women's basketball team starts its quest for a sixth consecutive Olympic gold medal against Senegal. The Americans have won 41 consecutive Olympic contests, while the African nation is looking for its first victory.
Hosts Brazil were booed off the pitch following a disappointing opening match draw against South Africa, and will look to get their Olympic campaign back on track against Iraq. World champions Mexico face Fiji and will also be looking for their first win of the tournament.
A day after the male cyclists took to Rio's streets, their female counterparts will follow suit on Sunday. A strong Dutch squad, featuring reigning gold medalist Marianne Vos and Anna van der Breggen, will start favourites, as will Americans Evelyn Stevens and Kristin Armstrong, British star Lizzie Armitstead and Poland's Katarzyna Niewiadoma are also in the field. They will be tackling a slightly shorter version of the men's course that caused all kinds of problems on Saturday when numerous riders lost chains or had other mechanical problems on the cobblestones.
The US men face Canada while and defending champions Russia follow against Cuba on Sunday evening. Later, the Iranian men make their Olympic debut in volleyball, which could give Iran's women a chance of watching the men in action for the first time. Women from Iran had earlier complained about not being able to attend sporting events in their country.
With inputs from AP