World number five, Rafael Nadal is hoping to continue his perfect form as he arrives in Spain ahead of the Madrid Masters.
The Spaniard is coming off two straight titles.
Another win at his home masters, which will feature all top-10 players, would re-establish him as a leading contender heading into Roland Garros, which starts May 16.
World number one, Novak Djokovic and number two, Andy Murray have also expressed cautious optimism on their expectations in Madrid.
Meanwhile, former world number one, Roger Federer has pulled out of the Madrid tournament with a back injury.
The Swiss great travelled to the Spanish capital for the tournament but was unable to practice and announced his withdrawal earlier on Monday.
The 17-time grand slam champion hopes to be back for the Rome Masters in one week.
