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 `` I look forward to the next stage of my life . Federer described Ljubicic as a great player and said he was the best tennis player in Serbia at that time.
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 great player and said he was the best tennis player in Serbia at that time.