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Goran Ivanisevic became Marin Cilic's coach in 2013, and the pairing has resulted in the Croat's most successful year to date. Julian Finney/Getty Images
The four titles he won in 2014 enabled Cilic to play in last week's season-ending ATP World Tour Finals in London, but he failed to win any of his matches in a tough group involving Novak Djokovic, Stan Wawrinka and Tomas Berdych. Julian Finney/Getty Images
Cilic falls to the floor in joy after defeating Japan's Kei Nishikori to win the U.S. Open in September. Julian Finney/Getty Images
Cilic and a visibly-drained Ivanisevic celebrate with their support team following the world No. 9's first grand slam victory. Julian Finney/Getty Images
Cilic, only the third player outside the 'Big Four' to win a grand slam since 2005, enjoys the Champions New York City trophy tour. Chris Trotman/Getty Images for ATP
His success was all the sweeter given that he won his last three matches without dropping a set -- beating Berdych in the quarters, Roger Federer in the semis and Nishikori in the final. Chris Trotman/Getty Images for USTA
Cilic beat Cyprus's Marcos Baghdatis in his first round match at Wimbledon in the 2013 Championships, but pulled out shortly afterwards upon learning of his doping ban. He returned in late October at the Paris Masters. Glyn Kirk/AFP/Getty Images)
Prior to his U.S. Open success, Cilic's best grand slam display was his march to the Australian Open semifinals, where he was beaten by Andy Murray, in 2010. Quinn Rooney/Getty Images
Cilic won the French Open as a junior in 2005 beating Dutchman Antal Van Der Duim. Three years later, he had his first senior title when winning the Pilot Pen Tennis tournament in Connecticut in the United States. Jacques Demarthon/Getty Images
Ivanisevic advised former coach Bob Brett to guide Cilic's development and the Australian worked with the younger Croat until last year. Frank Peters/Bongarts/Getty Images
A keen AC Milan fan, Cilic wears his Croatia top with pride as he plays table football with fellow tennis pro Andre Sa of Brazil on the day the two teams opened the 2014 World Cup. The South Americans would win 3-1 hours later in Sao Paulo. Matthew Stockman/Getty Images
