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"I had severe heart issues, I was battling through even surviving"
Ancic won three singles titles, reached the Wimbledon semi-finals in 2004 and achieved his career-high ranking in 2006.
But he struggled with the debilitating illness glandular fever otherwise known as mononucleosis, as well as back and knee problems.
Photo Credit:Mario Ancic of Croatia poses for a portrait session while attending the BNP Paribas Open on March 01, 2009 at the Indian Wells Tennis Garden in Indian Wells, California. (Photo by Clive Brunskill/Getty Images for ATP Tour)
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