Scarlets second row Sam Lousi scored a wonder try as Tonga made it two wins from two on their northern hemisphere tour with a 32-10 victory over Chile in Bucharest.
Lousi created and finished the first-half score on his return to international action following suspension. Scarlets team-mate Vaea Fifita also started the match for the Ikale Tahi.
In Cardiff, Ken Owens played a full 80 minutes in Wales’ much-needed 20-13 win over Argentina.
The experienced Scarlets hooker was again at the heart of a combative forward effort. He was joined late on by Ryan Elias, who was pressed into emergency back-row duty.
Wales will look to build on their opening victory of the autumn when they take on Georgia on Saturday lunchtime, while Tonga face Uruguay, again in Bucharest.