The brothers were in Birmingham for a night out when they returned to their vehicle – a £100,000 Range Rover – in the early hours of the morning, at which point a gang of five men blocked their path and tried to rob them.
One of the wannabe carjackers lashed out at Amir – the former world champion and Olympic silver medallist reportedly knocked him out cold.
The other five men then rounded on the two brothers from Bolton only for Amir and Haroon to surprise them by doing more than fighting back.
A source told The Sun newspaper: “They [the Khans] stood their ground and these guys got dropped one by one.”
Police had been called out after reports of a fight but, unsurprisingly, no one had come forward to make a complaint.