Paul di Resta admits that Force India's drop off in terms of form makes it difficult to predict the sort of result it could be capable of in this weekend's Singapore Grand Prix.

The Scot has scored on both his previous visits to Marina Bay, including a career-best fourth place in last year's race but, having seen the team fail to live up to previously strong records at both Spa and Monza, is reluctant to suggest that a repeat of 2012 could be on the cards this weekend.

Force India has struggled more than most since the enforced mid-summer change of Pirelli rubber, and has now slipped behind main constructors' table rival McLaren with seven races left to run.

"Given our form lately, it's difficult to know what to expect," di Resta said of Singapore, "It's a track I enjoy, a great venue, and we had a great result there last year with fourth place. It would be great to try and repeat that, but it's going to be tough given how competitive the grid is at the moment.

Related Articles

"There's no doubt that the tyre change had an impact on things. Plus, a lot of the teams have caught up with us for whatever reason, whether it's updates or the nature of the tracks. All we can do is keep working away to try and find some more performance. Everybody is giving 100 per cent because we know things can change around quickly in this sport."

Team-mate Adrian Sutil has also scored points in Singapore, despite admitting not to favour the Marina Bay circuit, and is targeting a repeat this year in a bid to keep McLaren within touching distance.

"It's not my favourite track, but it's one of those places that I've come to like more and more," the German conceded, "You almost forget you are driving at night because the lights are so bright and clear. The visibility is perfect, [and] there are some nice sections - it's quite wide for a street circuit, which helps with overtaking. I always enjoy street races and the city is amazing - the atmosphere means it's definitely one of the best races of the year.

"Singapore can sometimes generate surprises and there's always the risk of rain so, as a team, we need to be ready to react quickly and make the most of any opportunities. We've got to qualify well to give ourselves the best chance of scoring points. We are still close to McLaren in the championship and we need to make sure we keep a healthy margin ahead of Toro Rosso and Sauber."