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