Marin Cilic is the top Croatian professional tennis player who achieved a career-high ATP singles ranking of World No. 3 on 28 January 2018. Cilic has won 18 ATP singles title in his career including the US open in 2014. Before representing Croatia, he represented Bosnia and Herzegovina, his country of origin, as a junior with partner Zachary Rosen. Marie kick started his career playing on the junior ITF circuit in Spring 2004. In 2005, he won the French Open title in Boy's singles, beating Andy Murray in the semi-final and Antal van der Duim in the final. He played seven Futures tournaments in 2005, two Challenger tournaments, and one ATP International Series tournament. In 2006, he played three Futures, nine challengers, nine International Series events, and two Davis Cup ties. In 2007, he won the first and second professional tournaments of his career: the Casablanca Challenger and the Rijeka Challenger. The following year, he won his first ATP title. He won his first title of 2009 and second career ATP title Chennai Open, defeating first-time finalist Somdev Devvarman. He repeated his success in the Chennai Open, the next year beating Stanislas Wawrinka of Switzerland in straight sets. On 15 July 2012, Marin Cilic became the first home player to win the Croatia Open after a hiatus of 22 years.