With his gold medal win in the x200 freestyle relay, swimmer Michael Phelps (US) made history today and earned two Guinness World Records titles for both the most individual medals won and the most gold medals won at the Olympics.
The 27-year-old swam the anchor leg as the Americans won in a time of six minutes 59.70 seconds.
The victory took Phelps' career tally to 19 Olympic medals in total, helping him to overtake Russian gymnast Larisa Latynina record for the most individual Olympic medals.
"The Baltimore Bullet" achieved his impressive medals haul over the course of three Olympics, winning six gold and two bronze medals in the pool at the 2004 Games in Athens, a record eight gold medals at the 2008 Games in Beijing and two silver medals and one gold at this year's Olympics in London.
Phelps' 15th gold medal joins the six gold medals earned at the 2004 Olympics in Athens, and the eight gold medals earned at the 2008 Games in Beijing.
Just minutes before the relay victory, Phelps had claimed his 18th Olympic medal with a silver behind South Africa's Chad le Clos in the 200m butterfly.
Phelps, who is set to retire at the end of the Olympics, has the opportunity to extend his record further before drawing the curtain on his illustrious career, with the US sporting hero due to compete in three more races at London 2012.