The Liverpool left-back starred in their 4-0 win in Dublin.
He might have had his one moment of inexperience near the end when his poor back pass to goalkeeper Brad Jones nearly sacrificed their clean sheet but his performance showed a lot of promise.
Some may have recognised him from his substitute appearance in the 2-1 defeat to Chelsea at Stamford Bridge in the Premier League earlier on in the season, where he played more as winger rather than in his preferred left-back role.
In Dublin, Smith seemed to show some promise going forward, combined well with Jordon Ibe on the left hand side and also looked threatening going forward.
A lot of fans seemed encouraged by the youngster's display, and he may have given manager Brendan Rodgers something to think about as he prepares for the next season, as the Reds' boss looks to improve the defence and provide competition for when Jose Enrique returns from injury.
So, here is what users on twitter thought of the 20-year-old's performance:
i really like the look of Brad Smith. He's got a massive future.— Nico (@MrNickMason) May 14, 2014
Questioning whether we need to sign a lb in the summer, we have a big talent in Brad Smith.— Shaun (@Do_The_Studge) May 14, 2014
brad smith has got everything you want from a FB. strength, pace and almost perfect crosses— Djafu Merseyside (@DjafuMerseyside) May 14, 2014
Brad Smith has so much pace and fitness for a LB. Exciting to see him going forward— Your Average Joe (@Kevstar05) May 14, 2014