Zagreb, Croatia (Sports Network) - Former world No. 3 Ivan Ljubicic announced he will retire from the ATP World Tour next month.

The 32-year-old Croat will call it a career after next month's Monte Carlo Masters event. He resides in Monte Carlo.

Ljubicic said it wasn't an "easy decision" to call it quits, but he plans on staying "involved and contribute in some ways."

The 15-year pro owns 10 career singles titles, including one at Indian Wells two years ago when be upset current world No. 1 Novak Djokovic and former top- ranked stars Rafael Nadal and Andy Roddick.

The 6-foot-4 slugger has been a runner-up on 14 other occasions, led Croatia to its first-ever Davis Cup title in 2005, and captured a bronze medal in doubles at the 2004 Olympic Games in Athens.

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