Huddersfield enjoyed more possession towards the half-hour mark as Steve Mounie's rising effort cleared the crossbar and a series of crosses from Town left-back Chris Lowe tested Chelsea's defence. Yet, they didn't test Chelsea debutant Kepa Arrizabagala almost enough.
Hazard came on for Willian with just 15 minutes of the game remaining but that was enough time for him to make an impression and really stake his claim as one of the best players in the Premier League once again.
The Blues have endured a hard summer after Chelsea FC finished in fifth spot in the Premier League table last term. Sarri was animated on the touchline, ordering his men to play at a quicker tempo. Their play was much more fluid; they adopted the style of football Sarri likes his teams to play.
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And in the first game of the season it brought some reward with the French World Cup victor scoring the opener against Huddersfield.
Willian (Chelsea): Produced a driving performance, creating the first goal with his explosive pace and trickery.
Substitutes: Lossl, Smith, Diakhaby, Ramadan, Van la Parra, Depoitre (6), Stankovic. Subs: Loftus-Cheek 6, Moses 5, Hazard 7.
The midfielder, who joined manager Maurizio Sarri in moving from Napoli in July, scored in the 45th minute to help usher in the new era at Chelsea. Kepa beaten but Chelsea survive!
Sarri learns lessons from Chelsea's opening win at Huddersfield
Speaking after the game, the Italian was pleased with how his side got the job done against a "physical" Huddersfield line-up. However, they will certainly need to be more clinical and penetrative if they are to build on last season's fine work.
Huddersfield's response was swift, with Mounie heading Mooy's 36th-minute corner against the inside of the far post. Alonso is caught by Schlinder inside the box and the referee points to the spot! The Huddersfield defender is also booked.
Huddersfield only had three shots on target. Debutant Jorginho stepped up and coolly dispatched after a slow approach. This time Rudiger flicks on the delivery to set up Alonso but his acrobatic effort smashes against the woodwork.
Kante, however, was the standout player as the Blues opened their campaign with a 3-0 win. The Belgian worldwide broke down the middle and patiently waited for the right opportunity to pass before playing in Pedro, who dinked a nice finish.
FW Pedro, 8 - Linked up well with Azpilicueta in forward passages of play and was the main beneficiary when Hazard came on as he latched onto a pass from the Belgian worldwide to smartly score the final goal.
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Jorginho, whose passing was near-faultless throughout, feinted during his run-up before rolling the ball in, leaving the goalkeeper flatfooted.