Ajagba was awarded the win in the heavyweight bout without even throwing a punch.
Ajagba was to face American boxer Harper in only his sixth bout as a professional but he won the fight without throwing a single punch.
In a video that has gone viral on social media, Harper is seen walking away from the ring immediately the bell rang for the fight to start.
The American boxer climbed through the ropes of the ring and walked back to his locker room with everyone in shock.
Ajagba was awarded the win in Minnesota after Harper failed to return to the stage.
Harper, it was later revealed walked out of the ring in protest for not being paid enough for the fight.
“He’s not getting paid enough and he wants respect,” said According to PBC commentator, Jordan Hardy, who spoke to Harper after.
Ajagba’s promoter Richard Schaefer, however, believes that Harper walked off because of his fear for the Nigerian boxer.
“We waited a long time to have another heavyweight who instils fear in his opponents by just being in the ring and looking at them,” Schaefer said.
“The last time a fighter instilled that kind of fear in an opponent was Mike Tyson. The heavyweight division has a new star, and his name is Efe.
“No doubt that he is the biggest puncher in the sport. He defined what the most feared man in boxing means — no punch necessary. A look and the opponent runs out of the ring.”
The video of Harper’s walkout went viral on Twitter with Lennox Lewis, former unified heavyweight champion of the world Lennox Lewis sharing the clip.
“Curtis Harper was interviewed in the dressing room after this stunt. He said he wanted to ‘make a statement’ because he was not getting paid enough to face Efe Ajagba. Yeah, good luck fighting again here in the U.S. No promoter will work with you by pulling this bulls**t. #boxing,” a boxing fan on Twitter with the handle @FSalazerBoxing said.
“Efe Ajagba wins by DQ at one second into the first round. So that's the fastest win of all time in boxing history lol,” @BoxrecGrey wrote.
“Efe Ajagba stock gonna skyrocket off the strength of him literally making a man quit and walk out of the arena before a single punch was thrown,” @TrapBasquiat said.
Born in Ughelli, Delta State, while Ajagba took to sports as a kid it was football he first fell in love with.
He played football all through his secondary (High) school and even joined an amateur team. He quit football because he thought he had a slim chance of making it as a footballer.
On the advice of his friends who thought he had the height and strength of a boxer, he switched to boxing in 2011.
He searched for a boxing trainer himself and started learning the ropes.
Ajagba who worked menial jobs like cutting firewoods and in a bakery soon started representing Nigeria in amateur competitions.
He won a bronze medal at the 2014 Commonwealth Games in Glasgow and a gold medal at the 2015 African Games in Brazzaville.
He also won a gold medal in the Heavyweight category of the 2016 African Boxing Olympic Qualification Tournament and was the only Nigerian boxer at the 2016 Olympic Games in Rio, Brazil.
Weighing 90.91 kg with a height of 1.96 m, Ajagba can be mistaken for a brash and wild fighter but the 24-year-old is all about technique.
“For me, boxing is not all about power, it's about techniques,” he told Complete Sports in July 2015.
“Even when I went to the Commonwealth Games, I realized that I was even the smallest among the boxers in spite of my height.
“There were boxers bigger than me in height and size, but I didn't allow that to affect me. I just focused on my style which is about techniques because I am not a power puncher.”
After the 2016 Olympic Games, the Nigerian boxer headed to Canada where he signed his first professional contract.
He has six wins from six fights. Even though he is not a power puncher, five of his six wins have come via knockouts.
He needed less than a minute to knock out Nigel Paul from Trinidad & Tobago in the Heavyweight 91kg category of the 2016 Rio Olympic Game.