On his Wales debut, former Saint Regan Grace scored a try.
The former rugby league star produced a fine 18th-minute finish in only his third game of union since switching codes.
Wales, though, needed a Kieran Hardy try one minute from time to see them a home after they let slip a 17-point lead midway through the third quarter.
It was Wales’ first win this year after eight successive defeats that included a Six Nations wooden spoon and 2-0 Test series loss against Australia.
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