Cape Town - Rafael Nadal has no doubt that Andy Murray and Novak Djokovic will soon return to their best level again.
Last year, the top-ranked duo dominated the sport, but so far 2017 has been all about Nadal and Roger Federer, who have both returned to their world-beating best.
World No 1 Murray's 2017 form has been indifferent as he's struggled with injuries.
His recent clay court excursions in Monte Carlo and Barcelona both ended in early exits.
World No 2 Djokovic has also struggled with a 14-4 record, including a second-round exit at the Australian Open and defeats at the Mexican Open, BNP Paribas Open and Monte-Carlo Masters.
But Nadal knows that both of them are too talented to stay down for long.
"They will be at their best level again," said the Spaniard, as quoted by the Tennis World website.
"If they are World No 1 and 2, there is a reason.
"If it won't happen in the next events, it will be in the following ones, and if it won't be like this, it will happen after. They will be back more soon than later, unfortunately for me."
Nadal has no reason to fear either of them at the moment, however, especially on clay, where he is currently unbeaten following title victories in Monte Carlo and Barcelona.
"I am happy with my two titles won, and after two very good weeks now I work to be in the best condition heading in Madrid, Rome and Paris," he added.
"I am doing well and my goal is that my level keeps being high.
"I would like to fight to win Roland Garros, it can happen anything. However, winning in Monte Carlo and Barcelona are more than enough at the moment for me."