Not short on confidence, world number five Kei Nishikori is targeting a finals appearance on the red clay at Roland Garros.

Nishikori has never made it past the fourth round of the French Open but the Japanese star heads into the year's second grand slam in good form.

The 25-year-old has a 10-2 win-loss record on clay in 2015, having taken out the Barcelona Open in April, while he went deep at the Madrid Masters (semi-finals) and Internazionale d'Italia, where he lost to eventual champion Novak Djokovic in the quarter-finals in Rome.

Nishikori's form leading into the French Open is not too dissimilar to that of 2014, when he won both the Barcelona Open and Madrid Masters, only to crash out in straight sets in the first round at Roland Garros.

But Nishikori is optimistic about his chances in Paris this year, telling reporters: "I try to do my best and try to win the whole thing, but it's a tough tournament and everybody's playing. We'll see what happens.

"I'm still relaxed, there is a couple more days before the tournament starts so I'm still relaxed.

"[I will] have a good practice these couple of days and ready for Sunday.

"I hope I can win the tournament, but I've been practicing well and playing good on clay. I hope to go to semi [final] or final."