Australia's Vic Darchinyan gave Australian boxing a big boost as he retained his International Boxing Federation flyweight world title with a crushing fifth round technical knockout over Columbian challenger Jair Jiminez.

Darchinyan, who also retained the less prestigious International Boxing Organisation flyweight world title, completely outclassed and out-gunned a game challenger, who absorbed tremendous punishment.

The 29-year-old champion consistently hit the target with hurtful straight left punches to the head and let rip to the body.

Jiminez, 26, was almost too brave for his own good, especially in the fourth round.

A relentless Darchinyan sent the South American to the canvas in the first 20 seconds of the fourth with a volley of at least five blows.

Sensing an early finish, the Armenian-born champion pummelled his opponent for the last 60 seconds of the round.

The one-sided fight followed a similar pattern in the fifth round before Australian referee John Wright mercifully called a halt.

At the time of the stoppage, Darchinyan led by five points on two of the judge's cards and six points on the other.

It was unbeaten professional Darchinyan's 24th straight win, his 19th by KO.

Jiminez's record dropped to 22 wins, five losses and one draw.

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