By Matt Hladik Longtime French tennis standout Jo-Wilfried Tsonga announced on Wednesday that he will be retiring following this year’s French Open. Tsonga, the 2007 ATP Newcomer of the Year, has won 18 career professional singles titles and been ranked as high as the No. 5 player in the world. He’s also reached at least the quarterfinals of all four Grand Slams and has made the semifinals of Wimbledon and the French Open and the finals at the Australian Open. A 2012 Olympics silver medalist in doubles, Tsonga is one of three players to have Grand Slam tournament wins over tennis’ “Big Four” o…