The £37million January transfer signing from Porto opened his account against Norwich and was not only serenaded by the Anfield faithful, but also by those on his home continent - surprisingly to the tune of a classic Beatles song.
In the closing stages of the contest, the 25-year-old made an excellent run into the penalty area and was spotted by Reds captain, Jordan Henderson.
The England international spotted his movement, and produced a superb pass into Diaz who coolly chipped Canaries goalkeeper Angus Gunn.
The goal sealed a significant victory for Liverpool in the race for the Premier League title, closing the gap to within six points of leaders Man City after their dramatic loss to Tottenham on Saturday night - and with the Reds holding a game in hand.
Undoubtedly, every Liverpool supporter inside the ground was thrilled to see their new signing get off the mark.
And, whilst commentators are meant to be impartial, one South American broadcaster could not contain his excitement when the ball nestled into the net.
The hilarious clip saw the commentator sing a tune to Diaz's name, and not just any track, but to 'Ob-La-Di, Ob-La-Da', the famous song by Liverpool's most famous sons, the Fab Four themselves.
No, not Steven Gerrard, Robbie Fowler, Jamie Carragher and Trent Alexander-Arnold - The Beatles, of course.
Diaz received more than more song during the match, with Liverpool fans also belting out another new number, singing his name to the tune of 'Just Can't Get Enough' from Depeche Mode.
But there is every chance this impromptu performance from ESPN's South American commentary team could catch on in the Anfield terraces.
For Norwich fans, it's a case of deja vu having now been terrorised by another player by the name of Luis.
The Canaries faithful grew sick of the sight of Luis Suarez who, during his three-and-a-half-year stay in Liverpool, scored three Premier League hat tricks against them.
Reds fans will be hoping Diaz is just as successful as the Uruguayan and, given the start he has made to his career at Anfield, he could very well prove to be another excellent signing for they Merseysiders.