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Former world number five Jo-Wilfried Tsonga has announced he will retire from tennis after this year’s French Open. The 36-year-old has won 18 ATP singles titles and reached the 2008 Australian Open final, losing to Novak Djokovic. The Frenchman said it “took me a long time to make this decision”. Tsonga turned professional in 2004 and reached his only Grand Slam final four years later, losing in four sets to Djokovic in Melbourne as the Serb claimed the first of his 20 major titles. The Frenchman made it to the semi-finals twice at both the French Open and Wimbledon and…