Wales Under-21 gained comprehensive revenge over San Marino U21 in their Uefa Euro 2015 qualifier at Nantporth Stadium, Bangor.
Having suffered a 1-0 defeat in San Marino in September, Geraint Williams' side ensured there was no repeat.
Ellis Harrison opened with a 20-yard effort before the break and Lee Lucas hit home from double that distance.
Wes Burns broke free for his score and Billy Bodin completed the rout with a stylish finish.
The triumph followed Wales' 2-0 win over Lithuania at the same venue on Friday, 11 October.