Swimming at the 1964 Tokyo Summer Games:

The Americans thought they had the world’s best in this event in Chet Jastremski who had set the last three world records, including 2:28.2 at the US Olympic Trials in New York in late August. In the semi-finals Australian [Ian O’Brien] served notice when he won the first semi in 2:28.7, the second fastest time ever. Jastremski won the other semi and in the final, he took the lead through 50 metres. But he was passed on the next lap by Soviet Heorhiy Prokopenko, who led by three metres through 100. O’Brien stayed in second until late on the final lap, and caught Prokopenko only five metres from the wall, touching in 2:27.8 to better Jastremski’s world record, who came across in third. After the awards ceremony, Jastremski announced his retirement and soon entered medical school.