Argentina’s Juan Monaco announced his retirement from professional tennis on Monday at the age of 33.

Monaco, who reached his highest ranking of No.10 in the world in July 2012, won nine ATP singles titles during his career, eight of them on clay. He also won three doubles crown.

“Although it creates me a lot of nostalgia I am sure I am making the right decision,” Monaco said in a statement on Twitter. “I retire from professional tennis.

“There are so many feelings that it is very difficult to write them down … Thanks for what tennis gave to me: education, friendship and unforgettable moments.”