Daniil Kvyat admits he has a friendly relationship with Toro Rosso team mate Carlos Sainz, but the two men are not friends.
Stakes are high at the junior bull outfit with the Russian driver doing his best to warrant his seat in F1 after his demotion from Red to Bull to Toro Rosso last year, and the Spanish charger seeking a spot in atop team next season.
"In fact, Carlos and I were never friends," Kvyat told Russian radio Sport FM.
"We communicate well and treat each other with respect," he said.
"But on the track we fight to the end. It has not reached a point to be able to say that we have a problem, and I hope this will not happen. But everything is possible.
"Hopefully we will not cross that line," added Kvyat who turns 23-years-old today.
Sainz currently leads Kvyat in the world championship after three rounds, with 10 points against the Russian's tally of 2.
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