Red Bull's Horner says Sebastian Vettel is still getting stronger

The triple world champion took his third win of the season in Montreal with the biggest winning margin of the campaign that helped open up a 36-point advantage in the drivers' standings.

Horner had nothing but praise for the way that Vettel has shrugged off tyre frustrations this year to eke out a healthy title gap, and he said that all he was seeing was an improvement in form.

"He is continuing to get stronger, continuing to get better," explained Horner.

"He is a very focused and determined young man, and has achieved a huge amount in his career.

"But the impressive thing about him is how much desire he has to continue to improve himself. He obviously wants to achieve as much as he can."

Horner said that there was also evidence for the first time that Vettel may be willing to sacrifice some of his youthful exuberance, like chasing the fastest lap in the closing stages.

"Some things don't surprise us, like the fastest lap thing - which of course he was going for," he said.

"I said to Rocky [his race engineer], 'get him under control'.

"So he said to Sebastian after he went purple on the first sector - 'Monaco 1988, Senna'.

"I thought that might work and Seb came back on the radio and said, 'Alright, I am only joking' - with a purple sector. So he backed off."

Despite Vettel's advantage in the title standings, Horner also sees no reason to believe that his team is now in the driving seat for the championship.

"We are just focusing on trying to get the maximum out of ourselves and the drivers at each individual event," he said.

"While the points look healthy at the moment, Fernando [Alonso] put in another strong race and you cannot afford for any complacency.

"The margins can rapidly be eroded."