"It's always difficult in the first round of a Grand Slam, particularly against a player you don't know very well. Also, Andy had lost in the first round at the Australian Open and there is always some pressure.
"Andy will have some ups and downs against Acasuso - who will have the same - but I hope he keeps calm and quiet on court and does not stress himself if things are not going perfect.
"I have told Andy that on clay you have plenty of time to recover, especially in a best of five-set match. Hopefully, Andy is going to be positive and find a way to win. It's very difficult when you do not have the time to practise together. The goal is to get nearer Nadal and Djokovic and beat the other guys."
Corretja acknowledges that Murray can lose his cool on court and become distracted by his errors and has been hammering home the need for patience. Indeed, it would be a significant step forward if the Scot avoided one of his outbursts against Acasuso.
Corretja said: "Everybody needs to be calm - not just Andy - because nerves don't help anyone. He has good things to improve in his game, which is nice, and he has a great career in front of him. All he needs to do is work at his game.
"Without a doubt Andy can really play on this stuff. He will need to work and put in some more time. But if a guy like me was able to play indoors playing top spin, imagine what a guy like Andy, who is more talented than I was, can do [on clay]. It's just a matter of time."
Despite the rain yesterday some matches were completed with local favourite Amelie Mauresmo, the 22nd seed, securing a first round 7-5, 4-6, 6-1 win over Olga Savchuk, of Ukraine.
Dinara Safina, the 13th seed, started her French Open campaign with a comprehensive 6-1, 6-3 victory over the Ukrainian Kateryna Bondarenko.
The Russian victor was one of the form players coming into the tournament having won the German Open in Berlin.
