The men's 4 × 100 metre medley relay event at the 2016 Summer Olympics took place on 12–13 August at the Olympic Aquatics Stadium. In his final race before retirement, Michael Phelps led the U.S. men's team to a record-breaking triumph in the medley relay at the Games, finishing an illustrious career as the most decorated Olympian of all-time with his twenty-third gold medal and twenty-eighth overall. The American foursome of Ryan Murphy (51.85), Cody Miller (59.03), Phelps (50.33), and Nathan Adrian (46.74) put together a historic ending with a gold-medal time and a new Olympic record of 3:27.95, shaving 1.39 seconds off the previous mark from Beijing 2008 on a since-banned, high-tech bodysuit. Moreover, Murphy erased the 2009 world backstroke record (51.94) from Aaron Peirsol by nine hun