Anthony Joshua has the chance to extend his professional record to 20-0 when he slugs it out with Carlos Takam at the Principality Stadium on Saturday.
After the collapse of a potential rematch with Wladmir Klitschko, Kubrat Pulev was drafted as the mandatory IBF challenger to Joshua's belts. Takam has since replaced the Bulgarian and at 36-years-old will throw everything at his final title challenge.
The replacement fighter poses very different problems for Joshua who has conceded that the Cameroonian has a head like a 'block of cement.'
There's every suggestion that Joshua's 100% knockout record could be put to the test against a man who has only hit the canvas once in his 39 fight career.
If AJ forces a stoppage or has his hand raised in Cardiff, his fourth title defence will open the door to a number of lucrative fights in 2018.
Were Joshua to traverse the challenges of fellow champions Deontay Wilder and Joseph Parker as well as the likes of Tyson Fury and David Haye, the 27-year-old would enter the history books as one of the greatest heavyweights.
That's speaking hypothetically, of course, and Joshua still has a lot of learning to do.
Nevertheless, Joshua is already being cited as one of Britain's greatest ever athletes, seems certain to secure the BBC Sports Personality of the Year award and has attracted plaudits from big names.
The man himself is under no illusion of the heavyweight champions that he looks to as his heroes and the best of the best, however.
In an interview iFL TV back in 2014, the 27-year-old was asked to name the five heavyweight fighters that he considered the finest and he absolutely nailed it.
He started with Evander Holyfield, Lennox Lewis and Larry Holmes before he truly smashed it out the park.
You can't exactly argue with Mike Tyson and Muhammed Ali.
Check out the video of the interview and Joshua's justification for his picks:
While the heights reached by the final two in particular may seem unattainable, there's no reason to suggest the Brit won't be mentioned alongside them in the future.
Takam has to fall first, though - all eyes are on October 28.
Who do you think is the greatest heavyweight boxer in history? Have your say in the comments section below.