Horner believes Verstappen's ability to handle pressure was the most impressive part of his Malaysian Grand Prix victory.
It had threatened to be a shocking day for Ferrari after a turbo issue prevented Kimi Raikkonen from starting the race, but Vettel's recovery will provide some consolation to the Scuderia. It was also the second race win for the Red Bull Racing team in 2017, with the Daniel Ricciardo having won the Azerbaijan GP earlier this year. The victory also makes him the youngest ever victor at the Malaysian GP.
But the German has slipped to 34 points behind the Mercedes driver with five races to go and a maximum of 125 points still available.
"He drove a truly dominant race, making a sensational pass on Lewis and then really controlling the race from there". "I thought we had a great race auto but I didn't think it was going to be quite that great". Verstappen held onto second place for the first four laps, after which he ended up taking the lead from championship leader, Mercedes AMG F1's Hamilton. I have a good feeling about it.
"Saw Lewis was struggling a bit... of course he has more to lose in the championship, so I went for it at turn one".
Despite their Malaysia woes, Hamilton's result combined with team mate Valtteri Bottas's fifth place means Mercedes now lead Ferrari by 118 points in the constructors' standings, on 503 to 385. Hamilton was never near the Dutchman, and Verstappen even increased his lead as Hamilton eased off to save his tires at the end of the race.
Ferrari speed gives Vettel some hope
Hamilton came second to extend his drivers' championship lead to 34 points over Ferrari's Sebastian Vettel . But I think globally that we don't have the best auto and we've done an exceptional job with what we have.
But Vettel's world championship hopes suffered a huge blow when his Ferrari failed to set a time in the first qualifying session, meaning he will start last. I have no idea where it will be an issue and where it will be fine.
"So I am just trying to be smart with the decisions I make on track, so I didn't put up much of a fight [with Verstappen]".
"Spain was a fairytale because the first time he jumped in the vehicle he won the race", said Horner.
"You can see we were running slightly less downforce than the others, we don't have the T-wing here for example, and we have found a very good set-up".
"I don't know if he was unhappy about it or whatever but it didn't seem over aggressive from my side, it didn't feel like I did a real late move or anything".
"I did not really know how close Max was and I was having some problems with the auto and was struggling with battery power", said the Brit.