The Belgian superstar was crowned the Player of the Year two seasons ago but utterly flopped last term.
Now under Antonio Conte, Hazard is back to his very best and has been in blistering form in recent weeks to help Chelsea to the top of the Premier League table.
Ex-England ace Sinclair reckons Hazard has grown-up a lot over the past 12 months and he is now reaping the rewards of his hard work.
“He is playing better than he did two years ago. I think he’s matured as a player”
Trevor Sinclair on Chelsea star Eden Hazard
Ahead of Chelsea’s clash with Stoke today, Sinclair told the BBC: “He’s playing the game in third gear at the moment and really enjoying his football.
“He is playing better than he did two years ago.
“He understands what the Premier league is all about now and when he’s going to get a whack off someone and how to ride those challenges.
“I think he’s matured as a player.
“Sometimes when you have had disappointment, which last season was for Chelsea, you come back and you get all your full strengths and you are playing to the top of you ability, it feels a lot better.”
Fellow pundit Mark Lawrenson says Hazard has benefited hugely from being deployed slightly in off the wing.
Wing-backs Marcus Alonso and Victor Moses have been superb in Conte’s 3-4-3 formation and they allow Hazard and Pedro to rome further in field.
Lawrenson said: “The thing about him is he plays a little bit more inside now, as does Pedro, to allow the wing-backs to get further forward.
“Once you come and play inside, the pitch is bigger, completely bigger.
“He has been just absolutely fantastic.”