Novak Djokovic is still working on improving his serve
Djokovic progressed to the third round at Roland Garros by beating Jaume Manur in straight sets this afternoon.
The Serbian is looking to rediscover his top form after undergoing elbow surgery earlier this year.
World No 1 Nadal is expected to lift his 11th title in Paris over the coming fortnight.
And Djokovic wants to challenge him for the honour - but the 31-year-old acknowledges he must first work on perfecting his serve, a shot which he has had to adjust following his recent injury.
“I mean, at times when I have good days of serving, the serve, everything flows," he said.