Fia was called up for the first time for the November internationals and played for the first time in a Tongan side in Bordeaux last week when they beat the French Barbarians 49-38 in an uncapped match.
Tongan coach Toutai Kefu has kept faith with the side that ran in six tries in that game and the experienced Castres Olympique lock Steve Mafi is the only change to the starting XV. He comes in for Sam Ulufonu, while there are six changes among the replacements.
Veteran full back Vunga Lilo will win his first cap since the last pool game of the 2015 World Cup against New Zealand in Newcastle in 2015, while Bristol Bears centre Saile Piutau leads the team.
Newcastle Falcons scrum half Tane Takulua, who scored 24 points in Bordeaux, will be one of the men Wales will have to keep an eye on as they seek to make it three wins in a row this month and eight in succession overall. He is one of eight players who faced Wales in the last meeting in Auckland in 2017.
The other survivors are Piutau, hooker Ngauamo, lock Leva Fifita, flanker Dan Faleafa and replacements Latu Talakai, Latu Talakai and Leon Fukofuka.
Tonga (v Wales)
15. Vungakoto Lilo (Montauban, 42 caps)
14. Viliami Lolohea (Tasman, 3)
13. Alaska Taufa (Grenoble, 12)
12. Siale Piutau (Bristol Bears, captain, 34)
11. Daniel Kilioni (Grenoble, 12)
10. Kurt Morath (Doncaster Knights, 33)
9. Sonatane Takulua (Newcastle Falcons, 28)
1. Siegfried Fisi’ihoi (Stade Francais Paris, 5)
2. Paula Ngauamo (Agen, 15)
3. Ma’afu Fia (Ospreys, Uncapped)
4. Leva Fifita (Grenoble, 8)
5. Sitiveni Mafi (Castres Olympique, 27)
6. Dan Faleafa (Coventry, 17)
7. Fotu Lokotui (Counties Manukau, 5)
8. Sione Vailanu (Saracens, 2)
Replacements
16. Sefo Sakalia (Kolomotu’a, 5)
17. Latu Talakai (Waikato, 4)
18. Paea Fa’anunu (Castres Olympique, 7)
19. Onehunga Havili (Exeter Chiefs, 2)
20. Mike Faleafa (Perpignan, 5)
21. Leon Fukofuka (Auckland, 1)
22. Kali Hala (Counties Manukau, 9(
23. ‘Atieli Pakalani (NSW Country Eagles, 4)
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