The biggest fight of the year takes place this weekend between Anthony Joshua and Oleksandr Usyk at Tottenham Hotspur Stadium.
Joshua is preparing to make the second defence of his second reign as unified heavyweight champion. Usyk, meanwhile, is a former undisputed champion at 200lbs and the 2018 World Boxing Super Series winner.
What do both men have in common? They won gold at the 2012 Olympic Games.
If he can overcome the Londoner, he'll become just the second fighter after Holyfield to unify both the cruiserweight and heavyweight divisions.
Being the bigger man, and on home turf, Joshua is the favourite for the September showdown but he is up against a southpaw fighter who is undefeated from 18 fights.
In heavyweight boxing, one punch can change everything and Planet Sport has taken a look at some possible longshots.
Joshua is the bigger puncher and while he has not stopped an elite opponent in the opening round, he may see the opening round as his best chance to get rid of Usyk.
Joshua tends to lose concentration in the mid-rounds. When he had Wladimir Klitschko hanging on for dear life in 2017, Dr Steelhammer somehow landed a monstrous left hook to floor AJ in the fifth round.
The Londoner also tasted a sole defeat to Ruiz in round seven and if Usyk can wear down Joshua, then perhaps a body shot can do the damage.
Usyk has five wins inside the distance between rounds seven and eight, including a famous victory over Tony Bellew at 200lbs in 2018.
A fight is never over until the final bell, just remind Deontay Wilder of that.
Heavyweight boxing loves a dramatic ending and if the fight lasts until the final round then exhaustion will set in and then it's anyone's to win.