Then he went out and did something about it. The former pro boxer from Donegal, Ireland, put on an impressive striking display as he made short work of Jake Lindsey in his UFC debut on Saturday night.
The time of the TKO was 1:47 of the first round as the lightweight Duffy improved to 12-1.
"I feel good," Duffy said after his 11th career finish. "This is only the beginning."
Duffy looked confident with his boxing, as he kept Lindsey (9-3) at bay in the early going. He then connected on a sneaky left-footed head kick, followed by a pair of body punches, which dropped Lindsey to the mat. Herb Dean stopped the onslaught soon thereafter.
Duffy submitted Irish superstar McGregor in just 38 seconds in a 2010 Cage Warriors bout. That came one fight after a submission win over TUF:Smashes winner Norman Parke. Duffy took a three-year MMA sabbatical to compete in pro boxing before returning to MMA last year.