On 26 August, Conor McGregor will bounce out of the UFC octagon and into a boxing ring to go up against Floyd Mayweather in a multi-million-dollar super-fight in Las Vegas, Nevada.
It is the greatest case of a battle sportsman crossing codes and hoping to contend at the exceptionally most abnormal amount, yet it is not the first.
Boxers and blended hand to hand fighting (MMA) contenders have gone head to head previously, with blended outcomes. Here, BBC Sport glances back at three of the most elevated profile cases.
Royce Gracie v Art Jimmerson – 12 November 1993
Back at UFC 1, American light-heavyweight boxer Art Jimmerson entered the main UFC competition riding a 15-battle win streak in his standard game.
A national Golden Gloves middleweight champion as a novice, Jimmerson took the unusual choice of entering the octagon wearing a boxing glove on his left hand, with no glove on the privilege.
Beam Mercer v Tim Sylvia – 13 June 2009
At the point when Ray Mercer and Tim Sylvia consented to battle in 2009, it should be a fight between two blurring veterans of the battle sports world. Mercer was a previous world boxing heavyweight champion, while Sylvia had held the UFC heavyweight title.
In any case, after the battle was vetoed by New Jersey's state athletic bonus, the session was rescheduled as an MMA challenge, with men of honor's understanding between the combine that they would viably box each other, without any takedowns.
Randy Couture v James Toney – 28 August 2010
Previous multi-weight world boxing champion James 'Lights Out' Toney is the greatest name of the game of boxing to go up against an MMA contender, however at the end of the day it occurred in a pen, instead of the squared circle.
Toney pursued UFC president Dana White around the USA, demanding that his contenders couldn't punch and request a challenge with one of them.
White rejected his test, before he, at last, yielded and booked him to confront Randy 'The Natural' Couture.
Boxers have made the full-time move to MMA. Current UFC contender John Phillips boxed for Wales as a novice and was a piece of the Commonwealth Games group before taking up MMA in 2005.
Holly Holm won different world titles in boxing before changing to MMA and causing a stun by thumping out Ronda Rousey with a make a beeline for win the UFC bantamweight title in 2015.
Be that as it may, the key thing to note is the heading of travel. The boxers have moved into MMA, not the different way. That is the reason the up and coming Mayweather v McGregor session has extra interest, in light of the fact that the Irishman is conflicting with the grain.
At no other time has one of MMA's best examples, in their prime, ventured out of their usual range of familiarity against ostensibly boxing's pound-for-pound best for a challenge under the Queensberry rules.
With the drawing energy of the two men and the sheer weight of open interest, August's match in Vegas guarantees to deliver a special wearing display.