Conor McGregor exited his boxing debut versus Floyd Mayweather boasting some incredible achievements - which 'Money' and his dad have just torn to shreds.

In his very first pro boxing match, UFC megastar McGregor went 10 rounds with perhaps the greatest boxer in history and landed more punches on 'Money' than legends like Manny Pacquiao, Miguel Cotto and Shane Mosley.

Yet Mayweather Jr. says the punch count had nothing to do with McGregor and everything to do with his walk-down strategy, while Floyd Mayweather Sr. claimed his son did not even train for the fight, going in at "50 per cent" and "pounding" the Irishman. An anonymous Mayweather associate went so far as to say the kudos being given to McGregor was "bulls**t".

"That's because I wasn't counter-punching and boxing," Mayweather told FightHype.com of McGregor outlanding Pacquiao, Cotto and Mosley with 111 punches.

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"The reason why he probably landed a higher percentage or landed more shots than those guys was because I was coming straight ahead, I was barely moving, knocking his shots down a little bit and just breaking him down.

"That was the game plan, let him shoot everything. I know he was gonna shoot shots from awkward positions but the game plan was to dig into the body with good shots, hit him with left hooks, hit him with straight right hands and keep walking towards him, keep pressing him and pushing him back.

"I could have just stayed on the outside, out-boxed him and counter-punched him, and probably still stop him down the stretch but that's not what I wanted to do. I wanted to press and push him."

Mayweather said he had also gift-wrapped McGregor's seemingly impressive start to the fight.

"My thing is this, it's not how you start, it's how you finish. He can come out fast hands, use his range, using different angles and after the first four or five rounds, he wasn't the same fighter anymore," Mayweather said.

"I told you guys I was going to go straight ahead and I know going straight ahead I was gonna take some contact, I was gonna get hit with some shots but I wanted to give the fans and everybody around the world an exciting fight and I feel that's what we did."

Meanwhile, Mayweather Sr. trashed McGregor's feats by saying his son had effectively walked off the street after two years in retirement to beat the UFC fighter and take his record to 50-0.

"Floyd would have stopped [McGregor] a lot earlier if he worked even a little bit," Mayweather Sr. told Philly Voice. "Floyd did not train for that fight - he literally whupped that boy, that's what he did. Just imagine if my son would have prepared and would have trained that way he [normally] would for a fight, he would have stopped [McGregor] even sooner.

"What the world saw was only about 50 per cent of what my son is capable of doing. Yes, you can say it - it was like he literally came off the street to beat that man. That's how good my son is. That's basically it. I used to run with my son, but we haven't ran together in a long time. As far as I'm concerned, he didn't run for this fight. Floyd didn't put all of what Floyd could do in the McGregor fight.

"If the real Floyd Mayweather Jr. would have showed up for the McGregor fight, McGregor wouldn't have gotten out of the second round."

An unnamed member of Mayweather's camp added: "Floyd hit the speed bag or did a light run, but he spent more time promoting the fight and at his businesses than preparing for McGregor.

"There's no way around it, Floyd is a genetic freak. He's been fighting so long that things just come naturally to him. All this social media stuff about McGregor going 10 rounds with the best in the world is bulls**t. It's actually the other way around: A 50 per cent version of Floyd Mayweather came off the street and pounded one of the world's best MMA fighters and hardly trained to do it.

"It says how much better Floyd is than McGregor."

Mayweather himself revealed immediately after the fight that he hadn't even done any sparring for the last month leading into the McGregor bout.

"We had a cool training camp. I didn't box for the last month, I didn't do no sparring. There's no excuses, he came out here and fought a hell of a fight," Mayweather said back then.

"It was an injury, of course. Not an injury like that, but I wanted my hands to be 100 per cent for the fight.

"You know, I didn't want ... my hands are real brittle. Everybody knows that. I wanted my hands to be real solid when I came out here. So when I'm shooting hard shots, I'm able to break the guy down. Whereas if I were to box with a serious hand injury I wouldn't be able to punch as hard."