The London 2012 Olympics swimming championships are now officially over, Michael Phelps managed to win 18 Olympic gold medals and 22 Olympic medals in total before ending his swimming career. Sun Yang posted an extremely impressive 14:31.02 World Record in the men's 1500 freestyle, ahead of Ryan Cochrane (CAN) in 14:39.63 and now former Olympic champion Oussama Mellouli (TUN) in 14:40.31. The US women set a 3:52.05 World Record in the women's 4×100 medley, ahead of Australia in 3:54.02 and Japan in 3:55.73. USA also won the men's 4×100 medley, clocking 3:29.35 ahead of Japan in 3:31.26 and Australia in 3:31.58. And Ranomi Kromowidjojo (NED) added the women's 50 freestyle to her 100 freestyle Olympic crown, setting an Olympic Record of 24.05 ahead of Aliaksandra Herasimenia (BLR) in 24.28 and Marleen Veldhuis (NED) in 24.39.