Fans stunned as Horn sends Mundine to retirement with a knockout

Brisbane boxer Jeff Horn has delivered a stunning victory in his bout against Anthony Mundine, knocking out the veteran in the opening round.

The 30-year-old, aiming to bounce back from his first professional loss to Terence Crawford in June, delivered a left-hook which floored the ex-rugby league player midway through the first round on Friday night.

Following the fight the 43-year-old Mundine confirmed that it would be his last career fight. 

While Mundine talked a big game prior to the fight, he was classy in defeat and admitted that Horn was the better fighter on the night.

"Jeff proved tonight that he was the better man on the night, he got me with a shot early," he said.

"I was ready I prepared well but it's just boxing man you get caught sometimes."

Like the thousands of spectators in attendance at Suncorp Stadium, Horn admitted that he expected a tougher fight from arguably Australia's most famous boxer.

"I was expecting a tough fight," he said.

"I think he got caught up in the build up. I was expecting a hard fight. I feel really strong at this weight."

Horn, who has indicated he'd be keen to organise a rematch with Crawford in Australia if possible, is also exploring the possibility of pursuing fights at heavier weight divisions.