Caeleb Dressel just shocked the entire swimming world. 

The University of Florida senior broke the 18-second barrier twice in the same night at the NCAA Championships on Thursday in Minneapolis, setting a new American record in the 50-yard freestyle in the process.

After leading off the 200-yard freestyle relay with a 17.81, he then followed that up by breaking his previous American and NCAA record time in the 50 free with the 17.63 performance seen below.

Stay tuned for more as Dressel and some of the fastest swimmers in the world compete in Minnesota this weekend.