Force India team principal Vijay Mallya has hailed Paul di Resta following his good start to the season, saying he's "pushing the team on".
Di Resta picked up 20 points in the first four races of the campaign and his best display in F1 came in Bahrain last time out where he was unlucky not to claim his maiden podium.
"Looking at our drivers, the performances of Paul di Resta confirm just how much he has matured as a driver," Mallya said.
"He's delivering consistently every week and we are reaping the rewards of all his hard work. He suffered a difficult end to the 2012 season, but he's shown great mental strength and determination to regroup over the winter and recapture his best form. He's pushing the team on and demanding the best from everyone, which is what we need."
Di Resta's team-mate Adrian Sutil made a good return to Formula One after a year out as he finished seventh in Australia, but things haven't really gone his way since then.
"Adrian Sutil has also shown his speed so far but the luck has not gone his way," Mallya said. "The last two races have been very frustrating because he's been the victim of other drivers' mistakes. Without these incidents he would surely have scored well in both China and Bahrain. His race pace in Bahrain was remarkable because he was one of the fastest cars on track."
Next up is the Spanish Grand Prix at Barcelona and Sutil is optimistic that he will be able to challenge the front-runners.
"I know Barcelona really well from all the testing we've done there over the years. It is important, after three difficult races without points, to finish the race without any incidents. If I do that, I should have the pace to be among the front-runners.
"I have to do my job, avoid mistakes and hopefully my luck will change. Wherever we have gone so far, the car has been competitive, so the next few races should see us scoring points and close to the podium."