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Devin Haney beat George Kambosos Jr in a unanimous points decision to become the first undisputed lightweight boxing champion in 32 years.
Haney handed his Australian opponent his first professional defeat in front of over 40,000 fans at Marvel Stadium in Melbourne as he added Kambosos' WBA (Super), IBF and WBO titles to his WBC belt.
The American remains undefeated on 28-0 (15 KOs), and said after the fight it was a "dream come true".
All three judges at ringside scored the bout in favour of Haney, two by 116-112 and the other by 118-110.
Haney becomes the eighth boxer in history to hold all four titles at the same time, and the first lightweight to do so since Pernell Whitaker in 1990.
Following his history-making performance, Haney said: "I was comfortable. I was sticking to the game plan.
"The game plan was to go in and hit and not get hit, and I did that for the majority of the fight.
"I took the last round off because I knew I was comfortably ahead, but I fought a good, smart fight."
Kambosos was understanding in defeat, but said he wants a rematch down the line and indicated he will learn from mistakes made in this contest.
"I want to take the best test, the hardest test and I'm going to give him full respect for his victory and let him have his time," the 28-year-old said.
"We'll do it again. I have to implement a few things but I thought the fight was very close."