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F1 Boss Christian Horner believes that Sebastian Vettel is still improving as a driver. Vettel is the youngest triple world champion ever and only the third driver to take three World Championships in a row.  

"As a driver he will continue to develop, to get better. We are yet to see the best of him," said Horner. 

Horner would not go so far as to say that Vettel would beat Michael Schumacher's 91 wins and seven championships because Formula 1 performance is much tighter than it used to be.

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are pushing very hard to become top teams. 

"Only time will tell what Sebastian is capable of in the future but the exciting thing is we are yet to see the best of him," said Horner.

Still, the team has been able to improve for the past three years to hold the constructors' championship. It has a good base already for next year's car. 

"It gets harder, never easier. This year for sure was the hardest of the three. I think we had to show true strength of character as a team to fight our way back into the drivers' and constructors' championship," said Horner. 

Source: Autosport