A citizen of the United States as well as Great Britain and Bulgaria, Jayne won cadet national titles in both Great Britain and Bulgaria in 2013, but ultimately chose to represent the United States on the international stage, competing for Team USA at the 2014, 2015 and 2017 Junior World Championships, placing fifth in his final year of eligibility at the event. A wrestler for the University of Chicago, Jayne competed internationally in judo while pursuing a degree in mathematics. After graduating from the University of Chicago, Jayne moved down from 100 kg to 90 kg in 2019 and qualified for his first Senior World Championship in 2021 after the COVID-19 shutdown in 2020. A bronze medalist at his first Senior Pan American Championships in 2022, Jayne is currently the highest ranked U.S. man in the world rankings, holding the No. 36 position at 90 kg.