Boxer with Mayweather's defense + Leonard's Offense + Roy Jones jr's athleticism, who can beat him?

So we talking 86 tyson?

 

There is one boxer as described above and his name is, Sugar Ray Robinson.

 

Depends which weight class we talking about. You mentioned nothing about chin and when you weigh more than 92kg all it takes is 1 good punch.

 

This may sound crazy but Marvin hagler

 

Michael Nunn

 

You couldn't have someone with offence of Leonard with Mayweather's defence, simply because Mayweather pot shotted behind shoulder roll.

Leonard was combination puncher that used his feet, the dynamics don't really work in all honesty.

Same with giving RJJ Mayweathers defense it won't work, your completely changing a fighters style and who's to say RJJ would be more effective standing in pocket with shoulder roll like defense ?

 

Mayweather's shoulder roll, with Leonard's speed and combination punching, with Roys movement? Who can beat that complete fighter? Nobody. That's the making of an unbeatable fighter.

 

A prime welterweight Tyson

 

I was going to suggest to swap out Leonard for Hagler in the O/P's fantasy hybrid fighter for the offensive ( and chin) roll. Or even Duran.

 

Duran, he had a better inside game than Leonard and would have solved the philly shell and exposed Roy`s flaws, a fighter like M.Tyson would have beaten this hybrid fighter too, Ray Robinson was a master at using defense, had a better offense than Leonard and was quick enough to cancel out Roy`s athletletic prowess.

 

If Roy Jone's athleticism includes his chin....

 

A guy that’s a mixture of Mike Tyson, Roberto Duran, and Julio Cesar Chavez would be able to beat him.

 

Someone with seriously impeccable timing. It only takes one punch, especially as you didn't specify Golovkin's chin.

Whose timing is good enough?

 

Combine Thomas Hearns (height, reach, power, offense), Pernell Whitaker (defense, footwork, ring IQ, athleticism), and GGG (chin, relentless pressure, stamina) and you'll have a scary fighter to deal with.