Former world number seven Tennis player, Mario Ancic of Croatia has retired at the age of 26 to become a lawyer after years of battling illness and injury. Ancic, who earned the nickname Super Mario after reaching the Wimbledon semi-finals in 2004, achieved his career-high ranking in 2006 but had struggled after mononucleosis as well as back and knee problems. A Croatian daily quoted Ancic as saying that he was forced to quit because nature has decided it's time. Ancic, whose greatest moment came in 2005 when he won the deciding rubber in the Davis Cup final against Slovakia, is due to hold a news conference on Wednesday. Ivan Ljubicic, who Ancic partnered in 2004 to the Olympic bronze medal in doubles, expressed his sympathy for his compatriot.