Chelsea may be keeping pace with Liverpool at the top of the Premier League table with both sides level on 15 points after five games played, but Blues manager Maurizio Sarri feels that the Reds and defending champions Manchester City are still favourites for the title.
Having got in front, Chelsea took their foot off the gas at the start of the second-half and could have been made to pay when Ralls and Bobby Reid shot just wide from the edge of the area.
"I thought Hazard was one of the best players in Europe but now I change my mind because maybe he is the best", Sarri said after Hazard's man-of-the-match performance.
"'He's a target man - maybe the best in the world, I think so", he said.
Since then, Eden Hazard has made more than 250 appearances for the Blues scoring almost ninety goals and has even managed to win two Premier League titles, even being named in the Premier League team of the year on four separate occasions.
The Belgian struck in the 37th and 44th minutes to overturn Cardiff's early lead and added his third from the penalty spot on 80 minutes to take his goal tally to five in three games as Chelsea notched a fifth successive victory. Cardiff went into the worldwide break with a 3-2 loss to Arsenal, a game that earned the Gunners their second win of the season.
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Pep Guardiola started Leroy Sane for the first time this campaign and last season's Premier League Young Player of the Year looked more like his old self as Fulham were put to the sword.
"I have spoken to him in the last two days, yesterday I told him for me he can score 40 goals".
Eden Hazard is now the top goal scorer in the Premier League.
The boss thinks he wastes too much energy in the defensive half of the pitch.
"Now we have to prove that and do it again and again".
However, they had no answer to Hazard's trickery as he dummied a ball into the path of Olivier Giroud and then fired the Frenchman's return pass low into the far corner.