It is only a year ago that Roberts played inside centre for the first time on the international stage for Wales against South Africa. Now he has risen to the heights of partnering Brian O'Driscoll in the British & Irish Lions Test side.
"On a personal level, it is nuts, crazy. This is the highlight of my rugby career - an unbelievable achievement," said the 22-year-old Roberts.
"I hope it will be an inspiration for any young player. We have seen Leigh Halfpenny and Keith Earls, guys who are younger than me, show they can reach this stage so early on in their careers
"For those young professionals in the academies it proves that if you really work hard enough you can reach this level in a couple of years.
"We have a fantastic opportunity as a Lions touring team to get a victory out here. We know this game is going to push us all to new limits.
"Fitness wise, we know how tough it is going to be. It is going to be like nothing the boys have ever experienced before, but the guys are getting mentally prepared for that."