jeffrey christopher horn jr. (born 4 february 1988) is an australian professional boxer. he held the wbo welterweight title from 2017 to 2018. he was an amateur boxer for australia at the 2012 summer olympics in london. he reached the light welterweight quarter-finals at the olympics. in july 2017, he beat manny pacquiao for the wbo welterweight title. he lost the title to terence crawford in june 2018. he also won against anthony mundine in 96 seconds via first round knockout on 30 november 2018.