And with current No . 1 Djokovic `` coming from another world at the moment '' -- these are great times for tennis , he thinks . # ##čić retires from professional tennis after a stellar career which included 10 titles . The year - old was also part of Croatian Davis Cup team which beat Slovakia in 2005 . Says Djokovic displayed mental strengths as a youngster but was not the best technically . Ljubicic claimed the Indian Wells Masters title at the age of 31 in April .
# ##čić retires from professional tennis after a stellar career which included 10 titles . The year - old was also part of Croatian Davis Cup team which beat Slovakia in 2005 . Says Djokovic displayed mental strengths as a youngster but was not the best technically . Ljubicic claimed the Indian Wells Masters title at the age of 31 in April .