Ricky Hatton has rejected claims following his victory over Juan Urango that his powers are on the wane.
Hatton's next fight will be against Mexico's Jose Luis Castillo
The Briton was far from his best as he regained the IBF light welterweight title in Las Vegas earlier this month.
"The Americans know I'm a good fighter, but I've not had the two easiest opponents to look good against," Hatton told BBC Sport.
"I think I've looked as exciting as they expect me to be, but I know I can do better."
Hatton, who was suffering from a cold before the fight with Urango, added: "In my last two fights in the US, I've had two southpaws over two different weights and it has been difficult to move up and down weight divisions.
"Some of my opponents are awkward style-wise and you are not going to shine against them.
"That is nothing to do with my weight but all to do with the opponents.
"I'm going to America and beating world champions for their belts.
"I don't think many people can argue with 42 fights unbeaten and six world championship belts."
But Hatton insists that he still has one target left to achieve in his career.
"I've achieved the vast majority of my goals like topping the bill in Las Vegas, winning belts and boxing at Madison Square Garden and Atlantic City," he said.
"But to become the best pound-for-pound on the planet in any weight division would be amazing and I'm well capable of doing that.
"The only thing I have left to prove to anyone is to beat Floyd Mayweather."