Having netted for the Netherlands on Friday, the Reds midfielder repeated the trick as his country eased to a 4-0 win at Estonia in their Euro 2020 qualifier.
Wijnaldum wrapped up the victory for his country with a close-range header three minutes from time, after earlier goals from Ryan Babel (two) and Memphis Depay.
He played the whole of the Group C clash in Tallinn, as did Liverpool teammate Virgil van Dijk, with the Dutch now three points behind Germany and Northern Ireland with a game in hand.
Elsewhere in European qualifying, it was a tough evening for Andy Robertson as Scotland were beaten 4-0 at home by Belgium in Group I.