Whenever boxing's matchmakers put together a bout that promises fireworks and destructive drama from the opening bell, pundits and fans alike spit out the same three syllables.

Hagler-Hearns.

April 15 marked 35 years since Marvin Hagler and Thomas Hearns shared seven minutes and 52 seconds of unfathomable brutality in Las Vegas, setting an impossible bar for every all-action fight ever since.

Hagler and Hearns met in their primes as two stars of a golden age in the sport's middle weights. The celebrated "Four Kings" were completed by fellow greats 'Sugar' Ray Leonard and Roberto Duran.

There were nine fights in all between the quartet, spanning 1980 to 1989. Leonard and Duran met three times, with both men going the distance against Hagler. Hearns and Leonard shared 26 rounds over the course of two enthralling bouts separated by almost eight years.

And yet, the comparatively brief period Hearns and Hagler spent in one another's violent orbit stands as the high watermark of the era for many.

Here, we look back at three rounds that shook the world.

ROUND ONE

An elongated promotional tour taking in 21 cities whipped up severe animosity between the two fighters, with long-reigning unified middleweight king Hagler brooding over the perceived higher public standing afforded to fellow Americans Leonard and Hearns, along with the latter's withdrawal from their proposed 1982 meeting with a hand injury.

Hearns had showcased terrifying power at welterweight and light-middleweight. He demolished Duran inside two rounds in 1984, at the same Caesars Palace outdoor arena that staged his clash with Hagler.

Therefore, the expectations were of a measured start from the older man, who would draw the sting from a 26-year-old Hearns at a then-unfamiliar weight before taking him into deep waters.

Hagler was not reading from that script.

After eyeballing his foe throughout the introductions, he tore out of his corner at the opening bell and unleashed a wild and winging right hand that Hearns just manged to duck. The tone was set and there would be no let-up.

Hagler's gameplan – insofar as it could be deciphered from underneath the red mist – was to negate Hearns' three-inch reach advantage by attacking the younger man to the body.

Initially, that was a march straight into trouble as Hearns caught him with a left hand coming in and followed up with a right hook to shake Hagler.

The champion held for the briefest of respites before leather began to fly in centre ring – Hagler unleashing his chopping left hook and locating Hearns' chin to force a retreat to the neutral corner.

Hurt, Hearns shot back under heavy fire to escape the peril Hagler had planned on the ropes.

There was a minute gone.

The hunter and hunted patter was established. Hearns clipped Hagler with a left off the back foot to draw him on to a short right. Worryingly for the 'Motor City Cobra', 'Marvellous' was entirely unperturbed.

Hagler's booming straight right was working effectively, but Hearns' blurring fists continued to punctuate a fight in fast forward. A pair of rights found the jaw, still Hagler came. A flashing uppercut, still he came. But there was blood. A lot of it.

"There's blood all over Marvin Hagler's face, I can't tell where it's coming from," yelped commentator Al Bernstein

Seemingly spurred on by the change in circumstances, Hagler forced Hearns into the red corner and got to work, pounding the body. Hearns was sharp in the eye of the storm, soaking up two crunching left hooks and fighting his way out of trouble.

Well, until that unerring Hagler straight right sent him tottering backwards with nine seconds left in the round. By the time the bell sounded, they were trading once more.

Hearns landed 56 of 83 punches in the first round as Hagler connected with 50 of 82. It still beggars belief.

ROUND TWO

"Don't worry about the cut, Marvin," said his cornerman Goody Petronelli, unknowing that there were bigger problems afoot on the other stood.

At some point in the fury of the first three minutes, Hearns had broken his wrecking ball right. This perhaps explained his willingness to begin the second on the jab – that tool of relative conservatism largely lost in the maelstrom of round one.

Hagler met this adjustment with a change of his own. The switch-hitter turned to an orthodox stance for the first time in the fight and landed with a left-right combination.

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