Amir Khan signed off his amateur career with a superb revenge win over Olympic conqueror Mario Kindelan.
Cuban legend Kindelan had beaten Khan in the lightweight final in Athens, but he had no answer to the Briton in front of a passionate Bolton crowd.
After a cagey opening, Khan exploded on to the offensive and showed brilliant hand speed to prevail 19-13 on points.
Khan, 18, then announced he had agreed a pro deal with promoter Frank Warren, as Kindelan, 33, bowed out of boxing.
"I managed alright," said a modest Khan after the fight.
"This time I knew I was boxing Kindelan and I knew his style - we'd been working on it for a long time.
"I beat the best in the world."
Khan looked composed from the outset, entering to a huge ovation from the crowd who sang "Show me the way to Amir-illo" as an adaptation of the recently re-released Tony Christie song.
Another Warren fighter Ricky Hatton was at ringside with middleweight legend Nigel Benn, cricketer Freddie Flintoff and Bolton boss Sam Allardyce.
And Khan treated them, sizing up the hugely-experienced Kindelan in the first two minutes before taking control of the fight in the following rounds.
He rocked his Cuban rival with a couple of fierce punches and allowed the Olympic champion no way back.
"Amir beat the number one amateur fighter in the world and never looked like he was in any danger," said Warren.
"What else can you do? I will promote him and manage him as of now.
"Composure, confidence, skills - everything's there for him and will stand him in good stead," said Warren, who has called Khan the best Olympic prospect since Sugar Ray Leonard.