Six swimming world records have fallen in the first two days of competition at the Rio 2016 Olympics. Great Britain's Adam Peaty set his second world record in consecutive days, winning the men's 100 breaststroke by a huge margin of 1.56 seconds. The US men's team won the 4x100 freestyle relay. Michael Phelps, the most decorated Olympian of all time, now has 19 golds, two silvers and two bronzes.

In tennis, world number one Novak Djokovic was dumped out of Rio Games in the first round by Argentina's Juan Martin del Potro. The Serbian left the court in tears following the loss. On a day of upsets, the Murray brothers and Williams sisters also crashed out in the doubles.

After the first two days of competition, the US, China and Australia top the medals table with three golds each. Great Britain currently has one gold and one silver, but with more swimming, plus Tom Daley and the men's gymnastics team in action today (Monday 8 August) Team GB could add to its medal haul.
IBTimes UK presents the best photos from the first few days of competition at the Rio 2016 Olympics.

Rio 2016 Olympics best photos
Adam Peaty of Great Britain celebrates after winning the men's 100m breaststroke final and setting a new world recordStefan Wermuth/Reuters
Rio 2016 Olympics best photos
Britain's Adam Peaty competes to win the men's 100m breaststroke final, setting a new world recordFrançois-Xavier Marit/AFP
Rio 2016 Olympics best photos
Michael Phelps and Caeleb Dressel of the US celebrate after wining the men's 4 x 100m freestyle relay, giving Phelps his 23rd Olympic medal and 19th goldIan MacNicol/Getty Images
Rio 2016 Olympics best photos
Christopher Reid of South Africa swims in a men's 100m backstroke heatDominic Ebenbichler/Reuters
Rio 2016 Olympics best photos
Ruta Meilutyte of Lithuania dives into the pool during a women's 100m breaststroke heatMichael Dalder/Reuters
Rio 2016 Olympics best photos
Kathleen Baker of the United States competes in a women's 100m backstroke heatAl Bello/Getty Images
Rio 2016 Olympics best photos
Australia's Brittany Elmslie and Bronte Campbell compete in the women's 4 x 100m freestyle relay finalFrançois-Xavier Marit/AFP
Rio 2016 Olympics best photos
Kosuke Hagino of Japan celebrates winning gold in the final of the men's 400m individual medleyRichard Heathcote/Getty Images

French gymnast Samir Ait Said suffered a broken leg that was left dangling from below his knee following a crash landing from the vault. He was wheeled out of the arena on a stretcher. Britain's Ellie Downie had a scare when she mistimed a somersault during her floor routine and landed on her neck.

Rio 2016 Olympics best photos
French gymnast Samir Ait Said breaks his leg while competing on the vaultScott Halleran/Getty Images
Rio 2016 Olympics best photos
Team GB gymnast Elissa Downie falls and injures herself during the women's qualifications roundMike Blake/Reuters
Rio 2016 Olympics best photos
Germany's Tabea Alt competes in the qualifying round for the women's uneven bars eventBen Stansall/AFP
Rio 2016 Olympics best photos
Swiss gymnast Oliver Hegi competes on the floorAthit Perawongmetha/Reuters
Rio 2016 Olympics best photos
Simone Biles of the US goes through her floor routine during the women's artistic gymnastics qualificationsMike Blake/Reuters
Rio 2016 Olympics best photos
Segun Toriola of Nigeria plays a men's singles second round table tennis match against Koki Niwa of JapanMike Ehrmann/Getty Images
Rio 2016 Olympics best photos
Slovakia's Barbora Balazova eyes the ball in her singles qualification round table tennis matchJuan Mabromata/AFP
Rio 2016 Olympics best photos
France's Sofiane Oumiha lands a punch on Honduras' Teofimo Andres Lopez Rivera during the men's light (60kg) matchYuri Cortez/AFP
Rio 2016 Olympics best photos
Teofimo Andres Lopez Rivera of Honduras does a flip after his fight with Sofiane Oumiha of France in the men's light 60kg boxing preliminary boutDean Mouhtaropoulos/Getty Images
Rio 2016 Olympics best photos
Fabio Basile of Italy performs a flip as he celebrates winning the gold medal against Baul An of Korea during the men's -66kg judo finalLaurence Griffiths/Getty Images
Rio 2016 Olympics best photos
Odette Giuffrida of Italy celebrates after defeating Yingnan Ma of China during the women’s -52kg judo semi finalLaurence Griffiths/Getty Images
Rio 2016 Olympics best photos
Great Britain's Richard Kruse competes against Algeria's Victor Hamid Sintes during their mens individual foil qualifying boutKirill Kudryavtsev/AFP
Rio 2016 Olympics best photos
France's Lauren Rembi and Hungary's Emese Szasz fence during their women's individual epee semi-final boutKirill Kudryavtsev/AFP
Rio 2016 Olympics best photos
Manueli Tulo of Fiji competes in the men's 56kg weightlifting eventStoyan Nenov/Reuters
Rio 2016 Olympics best photos
Canada's Heather Bansley gestures to a teammate during their women's beach volleyball qualifying match against the NetherlandsLeon Neal/AFP
Rio 2016 Olympics best photos
Spectators watch the men's beach volleyball qualifying match between the Netherlands and Russia as the sun sets over CopacabanaLeon Neal/AFP
Rio 2016 Olympics best photos
A rower arrives for a training session before the race at the Lagoa Rodrigo de FreitasJeff Pachoud/AFP
Rio 2016 Olympics best photos
The sun rises behind the Olympic rings on Copacabana beachShaun Botterill/Getty Images

Schedule highlights - All times BST

  • Men's gymnastics team final (8pm)
  • Men's 10m synchronised diving - Tom Daley and Dan Goodfellow (8pm)
  • Women's rugby sevens final (11pm)
  • Men's 200m freestyle final (2:21am)