Roger Federer has praised Ivan Ljubicic ahead of his retirement next month . Croat Ljubicic will end his 14-year professional career after today 's Monte Carlo match . Former world No . 1 Federer described Ljubicic as a ` ` feared opponent '' Ljubicic won the Davis Cup with Croatia in 2005 and rose to world no in 2006 .
Roger Federer has praised Ivan Ljubicic ahead of his retirement next month . Croat Ljubicic will end his 14-year playing career after April 's Monte Carlo Masters . Former world No . 1 Federer described Ljubicic as a `` feared opponent '' Ljubicic won the Davis Cup with Croatia in 2005 and rose to world No.3 in 2006 .