Scuderia Toro Rosso have confirmed Daniil Kvyat as Jean-Eric Vergne's partner for the 2014 season.
Kvyat replaces Daniel Ricciardo, who takes Mark Webber's vacated race seat at Red Bull Racing's senior team.
The news comes as a shock to the paddock, with many believing Formula Renault 3.5 driver Antonio Felix da Costa to be Ricciardo's natural successor.
19-year-old Kvyat has been driving in the GP3 series this year for MW Arden (owned jointly by Mark Webber and Red Bull boss Christian Horner) and is currently second in the standings - seven points behind Argentine Facundo Regalia.
Da Costa finished third in the same competition last year.
The Russian and Portuguese drivers are flat-mates, and despite the disappointment, Da Costa remained supportive and humorous, tweeting: "It hurts but its like this, im happy for Daniil and that it stays in the Red Bull Family, enjoy mate Dany Kvyat".
"Looking for a new flat mate. Interests please retweet. #keepsmiling".
Toro Rosso principal Franz Tost has been quick to talk-up teenager Kvyat's ability, with many believing the decision to plump for him ahead of Da Costa being purely financially motivated.
"Daniil is a very talented driver, which can be seen from his results in all the junior categories," said Tost to Sky Sports F1. "He was a very successful Kart driver and, in 2012 he took the Formula Renault 2.0 Championship title with 7 wins.
"This year, he competed in six rounds of the FIA European Formula 3 Championship, taking one win, five poles and five podiums.
"In addition to this, he is still in a position to win the GP3 Championship, as he is only seven points behind the leader. He impressed our team with a strong performance and very informative technical feedback at the young driver test in Silverstone. This suggests that the basic qualities from which he can progress are all in place.
"Daniil can be sure that we will use all our experience of training youngsters to give him the best possible start to his Formula 1 career."
Kvyat, naturally, was delighted with clinching a drive in F1, also saying to Sky Sports: "This is fantastic news, a dream come true and I want to thank Red Bull and Toro Rosso for giving me this priceless opportunity.
"Ever since I began karting, I wanted to get to Formula 1 and now that wish will become reality next season. I had a brief taste of working with the Toro Rosso team, when I drove for them at the Silverstone test and I enjoyed the experience very much.
"The fact I am based in Italy and speak Italian will, I am sure, help me to become part of the team very quickly."
The news means that Toro Rosso are the third team to confirm their driver line-up after Red Bull and Ferrari.
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