The visitors made a half-time change, bringing on Laurent Depoitre for Abdelhamid Sabiri, but within three minutes of the restart they were 4-1 down as David Silva curled an exquisite free kick high into the net.
Dominant from the first whistle, City were in a different league to Huddersfield, who struggled to deal with their adversaries all over the pitch, and some statistics to emerge from the game at the John Smith's Stadium just emphasise what a one-sided game it was. "Of course, he was so motivated because his family, parents, wife, and especially Mateo were here".
Aguero also scored two goals in City's 2-0 win over Chelsea in the Community Shield. His son will never forget the first time he saw his father play football, he scored this outstanding goal.
Top of the highlight reel in the latest exhibition by City was a 70-meter pass from goalkeeper Ederson Moraes from his own penalty area that found Aguero running behind Huddersfield's defensive line.
Of course, with so long left, it was nearly inevitable that the Blues would inflict further damage and it came on 75 minutes as Mendy sent in a fine low cross and Aguero deftly volleyed past Hamer from close range for yet another hat-trick in sky blue.
However, City restored their three-goal advantage two minutes into the second half, with David Silva curling home a superb free-kick on his 250th appearance.
After a frustrating opening 25 minutes Aguero commenced the scoring with a sumptuous chip which opened the floodgates.
The Terriers were without Socceroos midfielder Aaron Mooy for the contest, who was with his wife ahead of the birth of their second child, and Pep Guardiola's men duly made them pay. "This period since we arrived, the Community Shield, Arsenal, today, it's ideal".
Unbeaten Watford are alongside City as joint leaders after an eye-catching win at Burnley, who have gone seven league games without a win, following early second half strikes from captain Troy Deeney and Will Hughes.
"I thought to take Sergio off before the hat-trick but in the end it was flawless, he scored a goal and off to a standing ovation".