Ivan Lendl, the tennis player ranked No. 2 in the world, denied today a report published in London that he is defecting to the United States from Czechoslovakia.

It was learned that Lendl is considering applying for residency in Monte Carlo, a principality offering favorable tax laws.

Lendl met briefly with newsmen covering the Association of Tennis Professionals tournament here and when he was asked about the reports he is defecting to the U.S. said, "No, it is not true."

In Washington, representatives of ProServ Inc., his agent, issued the following statement for Lendl:

"I have absolutely no plans to defect to the United States. I don't know where these reports started. I am playing many events and my schedule does not permit time to go to Czechoslovakia. I had planned to go in September for the Davis Cup, but with my suspension from the Czech team, I won't be going. I still want to play in the Davis Cup and am in the process of negotiating with the Czech government to rejoin the team."

Lendl, 23, was suspended from the Davis Cup team for participating in a tournament in South Africa.

The London Daily Mail quoted Vladimir Skutina, a Czech writer living in Switzerland, as saying Lendl will "sever links with his homeland, but hopes to do so without becoming a dramatic political issue."

Lendl advanced to the semifinals of the $375,000 ATP Championship when his quarterfinal opponent, Kevin Curren, defaulted today. Curren told officials he withdrew because of strained ligaments in his right hand.

Lendl, the defending ATP champion, is the No.2 seed in the tournament. He will face Mats Wilander of Sweden in Saturday's semifinals.