Mikor a [[Floridai Egyetem]]benen elsőéves volt, az egyetemi országos bajnokságon megnyerte az 50 méteres gyorsúszás versenyszámát.<ref name="SWM">{{cite web |url=https://www.swimmingworldmagazine.com/news/video-interview-caeleb-dressel-storms-to-third-in-the-world/ |title=Video Interview: Caeleb Dressel Storms to Third in the World |publisher=''Swimming World'' |accessdate=August 22, 2015}}</ref> A [[San Antonio (Texas)|San Antonióban]] megrendezett amerikai bajnokságon megnyerte az 50 és a 100 méteres gyorsúszás versenyszámát.<ref>{{cite web |url=http://www.omegatiming.com/File/Download?id=00010F020B00000002FFFFFFFFFFFF02 |title=Men's 50 meter freestyle final results |publisher=Omega Timing |accessdate=August 22, 2015}}</ref><ref>{{cite web |url=http://www.omegatiming.com/File/Download?id=00010F020B00000102FFFFFFFFFFFF02 |title=Men's 100 meter freestyle final results |publisher=Omega Timing |accessdate=August 22, 2015}}</ref> Az 50 méteren ment 21,53-as idejével negyedik helyen végzett a szám éves összesítésében.<ref>{{cite web |url=http://www.swimmingworldmagazine.com/news/caaleb-dressel-takes-gold-in-50-free-final-at-usa-nationals/ |title=Caeleb Dressel Takes Gold In 50 Free Final At USA Nationals |last1= |first1= |date=August 8, 2015 |publisher=''Swimming World'' |access-date=November 5, 2015 }}</ref><ref>{{cite web |url=http://www.swimvortex.com/bruno-fratus-leads-the-speed-stakes-with-21-37-relay-opener-at-brazil-nationals/ |title=Bruno Fratus Leads The Speed Stakes With 21.37 Relay Opener At Brazil Nationals |first1=Craig |last1=Lord |date=December 17, 2015 |publisher=Swimvortex |access-date=December 17, 2015 |accessdate=2017-07-30 |archiveurl=https://web.archive.org/web/20170608145657/http://www.swimvortex.com/bruno-fratus-leads-the-speed-stakes-with-21-37-relay-opener-at-brazil-nationals/# |archivedate=2017-06-08 }}</ref>
