Daniel Ricciardo says Sebastian Vettel has been his toughest team-mate in F1 despite comfortably beating the quadruple world champion this year.

Vettel was seen as the team leader at Red Bull at the start of 2014, but Ricciardo adapted quickly to the new regulations and went on to take three victories while Vettel failed to win all season. Despite having been closely matched to Jean-Eric Vergne in their two years together at Toro Rosso, Ricciardo said Vettel had proven to be the biggest challenge for him when it came to trying to get the better of his team-mate.

"I mean definitely on paper, yes, but at the same time I don't want to take anything away from previous team-mates," Ricciardo said. "I feel I've had with Jean-Eric a pretty good rivalry and even the few races with the Tonio [Liuzzi] in HRT; the first four races he dominated me in qualifying and normally qualifying was my strength.

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"So you always find a weakness I guess in yourself when you a have a new team-mate or a strength in someone else, but yes coming in to the season I was like, 'Seb's going to be the toughest challenge yet', and he was. You know obviously on paper I had the wins but it was still, it wasn't a breeze, no."

With Daniil Kvyat coming in as Vettel's replacement in 2015, Ricciardo doesn't feel he will have too much extra pressure to beat his team-mate next season.

"I don't think so, I think now I've reached pressure. You have pressure and then it's all ... pressure's what you make of it. I think I've been in high pressure situations and I can't really imagine more now. I think obviously with Danny [Kvyat] it's a new challenge and yes I'm a bit in Seb's position, people will probably expect me to be the quicker guy than Danny but obviously that's up to me to make sure I am."