Swimming at the 1968 Ciudad de México Summer Games:

The last five world records in this event had been set by USA teams and it was really a matter of how much they would win by in Mexico City. The race was held on the first day of swimming at the 1968 Olympics. On the first leg of the final, Zac Zorn opened two body lengths on Frank Wiegand of East Germany and the race was over. Steve Rerych, who had suffered from the tourista in Mexico City and had to withdraw from the 200 final, streaked 52.8 on the second leg and nobody was close. Mark Spitz increased the lead on the third leg and Ken Walsh brought them home in a world record 3:31.7 to win by 2.5 seconds over the Soviet Union.