Franz Tost has been full of praise as he issued the half-term report on the "fantastic" Daniil Kvyat and unfortunate Jean-Eric Vergne.
Despite entering Formula 1 from GP3, Kvyat quickly began to find his feet.
And although he trails his more experienced team-mate by six points to 11 in the Championship and is behind in the qualifying battle by five to six, he has impressed many in the paddock with his pace.
One of those being team boss Tost.
He said: "He is doing a very good job, taking into consideration how little mileage he was able to do before the season, he is driving very well, showing that he has natural speed.
"Equally importantly, he has had no accidents, nor has he made any mistakes. He is doing a fantastic job."
As for Vergne, Tost says there is still more to come from the Frenchman.
"He has suffered a lot with reliability issues, but when his car was running fine, he delivered good performances," said the Austrian.
"Thanks to his experience he makes an important contribution to the team's technical development and I'm convinced that there is still more to come from him."