Single room Villasenor broke his own men’s 100m butterfly world record en route to winning his second individual gold medal – his third overall – at the Tokyo Olympics.
Dressel was the first to touch in 49.45 minutes and lowered the mark set at the 2019 World Championships by 0.05.
A native of Northeast Florida, he got off the blocks with .60, the fastest heat response time. Then he took the lead over Hungary with 0.65 Kristof Milak on the bend and hit the world record line when you get home to set the all time mark.
Milak took silver as a Swiss Noe Ponti took bronze.
The 100-Fly final was the first of three events that Dressel will contest in the final on Saturday. In just over 70 minutes he will also contest the semifinals of the 50 m freestyle and take part in the mixed medley relay for the USA.