Peterson threat on Khan radar; boxing.
Khan defends his WBA and IBF belts when he faces hometown hero Peterson in Washington this weekend and does so as the clear favourite against an opponent who has so far fallen short in his two biggest tests.
Peterson lost a wide points decision to WBO light-welterweight champion Timothy Bradley in 2009 before getting off the canvas to salvage a draw against Victor Ortiz last year.
While the American has had to rebuild and earn another shot, Bolton's Khan (26-1, 18KO's) goes from strength to strength and made a real statement by adding Judah's IBF title to his own WBA belt in July with a slick performance which culminated in a fifth-round knockout.
However, Khan is well aware of the danger posed by Peterson (29-1-1, 15KO's) and even believes he is in for a harder night than against Judah.
"I definitely think this will be a tougher fight for me than Zab Judah was," Khan, 24, said.
"At the end of the day you have to remember that while Peterson might not be one of the biggest names, he's one of the most dangerous opponents in the division.
"He's been in the top 10 for a long, long time. He's had some big fights and has only lost once, against Timothy Bradley - and that was on points - and he drew against Victor Ortiz. He's the number one contender for my IBF title. It just shows that he's a tough character."