WLADIMIR KLITSCHKO might be fast approaching 40, but he is still the most dominant heavyweight since Lennox Lewis.

Right now, his reign of heavyweight terror looks like continuing.

Wladimir Klitschko

The Ukrainian bids for his 18th consecutive world title defence when he defends his IBF, Super WBA and WBO titles against American Bryant Jennings at Madison Square Garden at 1am on Saturday night.

It's another big fight being shown on BoxNation, the Channel of Champions.

Jennings is a big underdog, but we assess his and other boxers' chance of breaking Klitschko's iron grip on the heavyweight division.

Lucas Browne

Popular Aussie Brown is likely to challenge WBA regular champion Ruslan Chagaev next and that is his best chance of ever winning a world title. He can punch and is tough, but will need more to defeat Klitschko.

Lucas Browne

BoxNation viewers saw him have a hard time beating Andriy Rudenko, the Ukrainian handily defeated by Hughie Fury.

CHANCE OF WINNING: 3/10

Ruslan Chagaev

Holding the WBA belt gives him a chance of rematching Klitschko, who inflicted his first career defeat in June 2009.

Ruslan Chagev

Chagaev was badly outclassed when he stepped in at two weeks' notice to replace David Haye. Bravery was his only trait that night.

CHANCE OF WINNING: 3/10

Tyson Fury

The Lancashire-based traveller will fight the winner of Saturday's heavyweight dust-up after battling to the mandatory position with the WBO.

Tyson Fury

There is real hope that he will have some home advantage, which helps, but it is Fury's size and good hands that can cause Klitschko problems.

CHANCE OF WINNING: 6/10

Vyacheslav Glazkov

The number one IBF contender only weighs around 15st 10lb, but is making decent progress once again after a draw against Malik Scott in February 2013. Scott kept him on the end of his jab all night long, and Wlad would surely do the same.

Vyacheslav Glazkov

The Scott draw is his only blemish in 21 bouts and his chance will come.

CHANCE OF WINNING: 2/10

Bryant Jennings

Could the Philadelphia man be in the right place at the right time?

Jennings, who has won all 19 fights, booked his crack by snatching a split decision off of Cuban Mike Perez last July.

Bryant Jennings face off with Wladimir Klitschko

Although a small heavyweight, Jennings does have a reach advantage over Klitschko and insists that he will stick to a game-plan and not freeze when under pressure.

CHANCE OF WINNING: 4/10

Alexander Povetkin

Povetkin dropped a unanimous decision when he fought Wladimir in October 2013. He was floored three times, but showed incredible bravery to last the distance.

Alexander Povetkin

To be beaten, the champ Klitschko would have to become old overnight.

CHANCE OF WINNING: 2/10

Mike Perez

Like so many Cubans, Perez is erratic but on his day it would take a top heavyweight to turn back his challenge.

Mike Perez

Many believe he is still getting over the psychological effects of his gruelling points win over Magomed Abdusalamov, which left his rival suffering a brain injury. He may not be mentally strong enough to trouble Klitschko.

CHANCE OF WINNING: 3/10

Andy Ruiz

Unbeaten Ruiz has won all 24 fights despite carrying a mountain of flesh around his midriff. His best win came when he stopped previously unbeaten Joe Hanks in July 2013.

Andy Ruiz

His hands are much faster than people give him credit for. It would be no shock if he got a crack next year if Klitschko is still about.

CHANCE OF WINNING: 2/10

Bermane Stiverne

Wilder brutally exposed him when taking his WBC crown, boxing rings around him and winning easily on points. Klitschko has far more technical ability than Wilder and would surely toy with the Haitian-born slugger.

CHANCE OF WINNING: 2/10

Deontay Wilder

A unification between WBC champion, Wilder and Klitschko is the biggest fight out there in the division, globally.

Deontay Wilder

Wilder would obviously be a huge underdog like anybody else in the division. But he has serious power and poses a real threat.

CHANCE OF WINNING: 6/10