Charles Martin Predicts Anthony Joshua KO, Questions Brit's Stamina and Skills

Charles Martin has predicted a knockout victory over Anthony Joshua on Saturday, claiming the IBF heavyweight title challenger doesn't have the stamina or skills necessary to win at London's O2 Arena.

Both fighters travel to England's capital with undefeated records, but Joshua has gone beyond the third round just once in his 15 professional fights, stopping Dillian Whyte in the seventh round back in December. That's where Martin senses his major advantage, per BoxingScene's Keith Idec:

"

He's not ready. And he's gonna get tired, like he always do. He's gonna get tired, thinking he's gonna go five rounds. He's gonna get tired and that's when I'm gonna jump on his head, man, period. I know I'm gonna knock him out. 

In that Dillian White fight he got real tired. And he don't got no footwork, he can't box. The only thing he's relying on is his power, and I've got more tools than that. I'm more than just a powerful puncher. I can do it all. That's what I'm taking into the fight—I've got more in my arsenal.

If he thinks he's gonna be able to land hard punches on me and stuff like that, he's got another thing coming. I'm very elusive, so we'll see when it's time to take care of business.

"

Expectations are high for 2012 London Olympics gold medallist Joshua, 26, as he approaches the biggest fight of his career thus far—although he showed signs of wobbling in his win over Whyte last time out.

The seven rounds endured against Whyte was more than twice as long as any of the Briton's other fights, having knocked out all his opponents prior to that in the third round or earlier, and Martin may require another step up.

Kirsty Wigglesworth/Associated Press

Joshua is looked upon largely as one of, if not the brightest prospect emerging from the British boxing ranks, but Martin also boasts an undefeated record of 24-0-1, with 21 of those victories coming via knockout.

The American went on to say his experience will also provide him with an edge at the O2, where he feels he'll be far more "comfortable" than Joshua in the ring:

"

I've got more fights than him in the amateurs and the pros, and overall I've got more experience. That's what I'm basing this off of. It don't matter about who you got in the ring with as a professional and fought because experience and getting comfortable is what it's all about. I don't feel that he's comfortable enough in the ring, especially not with me being in the there. When I get in there and start doing the things I do in there, it's gonna be a different story. It's gonna be a whole different look.

"

This will be the current IBF heavyweight champion's first bout outside the United States, having defeated Ukrainian Vyacheslav Glazkov in the third round of their meeting back in January, where he claimed the vacant title.

With such a prize on offer, Joshua will undoubtedly be motivated to seal his 16th professional win, but Martin spoke to Sky Sports Boxing and gave his own determined declaration earlier this month:

Joshua's climb up the heavyweight ranks has been extremely gradual, but he's fought frequently since turning professional in October 2013, averaging roughly one fight every two months since then.

However, 29-year-old Martin turned to the professional circuit just a year earlier than his impending opponent, having turned professional in October 2012, fighting on average every 1.75 months since that date.

While one might debate the level of competition, it's worth noting the southpaw, like Joshua, hasn't made a habit of long, drawn-out clashes. Martin has gone beyond the fourth round just three times in his 23 victories, winning the last three in three rounds or fewer.

The pressure is on both fighters to produce the goods in London as Joshua seeks the biggest belt of his career, but Martin has added further burden to his quest after vowing to knock the British behemoth out.