Toro Rosso may not have set the timesheets alight on the opening day of the 2013 USGP in Austin, but Friday morning practice was notable for the debut of 2014 driver Daniil Kvyat.

The Russian, who was named as a somewhat surprising replacement for the Red Bull-bound Daniel Ricciardo last month, made his first official appearance alongside the Australian, having gained the necessary superlicence during a private test at Mugello in the build-up to the US event.

Although his maiden outing was cut-short by fog, which delayed the start of the morning session, and the need to summon a replacement medical helicopter, which brought out a red flag after only a few minutes of running. Kvyat was able to complete 20 laps, ending up 17th overall, but only a couple of tenths off his more experienced team-mate.

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"I enjoyed every single moment of driving the track, even though there was a delay because of the fog and then a red flag," the teenager commented, "We didn't do the full programme of course, because the session was shortened, but we still did 20 laps, which is important mileage for me.

"It was good to go out there to try and find the limit of the car and the brakes, and we also managed to do some aero measurements. Of course, I've finished driving here but, for the rest of the weekend, I will be attending all the engineers' briefings, which again will be a very valuable experience."

STR's Laurent Mekies confirmed that Kvyat's outing had been useful, despite the cut in track time, and praised the Russian for his feedback.

"It was the first time for Daniil in the car with us and, unfortunately for him, the session got shortened," Mekies acknowledged, "But still the track was in a much better condition in FP1 than last year so this allowed him to get reasonable running. At the end of the session he got 2 runs in the car and he did a good job with no mistakes and gave some interesting feedback to the engineers. It was a good first try - so well done to him."

While Kvyat dropped to 19th on the combined standings as conditions improved for his rivals after lunch, Ricciardo moved up to 14th, despite not being entirely happy with what he was getting from his STR8.

"Today was not what we had hoped for in terms of real performance," he confessed, "We were a little bit off the top ten, which is where we want to be.

"I felt as if the tyres were a bit too hard for conditions today, as it was taking a long time for them to warm up, and I wasn't really happy with the balance of the car, both morning and afternoon. We still have some work to do tonight to understand how to improve the car and, hopefully, we can come up with some good solutions for tomorrow."

Kvyat's debut came at the expense of the man he will partner next season, and Jean-Eric Vergne made the most of 90 minutes' running after lunch to dial himself into 17th overall.

"I've got no problem with Daniil driving my car in FP1, as it's good experience for the whole team for next year, but it does make life a little bit harder when you only drive one session," the Frenchman conceded.

"We struggled with the car today and I wasn't happy with the set-up, but at least the long runs were good given the problem we had with the balance. We definitely have to work hard tonight for qualifying, but I'm confident we can improve and be more competitive tomorrow."

Mekies confirmed that Ricciardo and Vergne had been following different set-up paths in the afternoon session, but had not yet hit on the perfect balance for either car.

"Obviously it was a little bit more difficult for JEV who had to jump straight into the car in FP2, but we are equally unhappy with Daniel and therefore we have scanned a lot of things to try to find a best possible solution for tomorrow," the Frenchman reported, "The two cars ran quite differently in terms of set-up this afternoon, and I expect, by putting together the best of both worlds, that we should be able to get back into our usual midfield positions tomorrow."