Andy Murray’s French Open career may have ended in a whimper after losing in straight sets to Stan Wawrinka in the first round. The British tennis star has indicated that he’ll retire from professional tennis this summer as he embarks on a possible farewell tour. After edging closer to becoming a seeded player once again last year, Murray has dropped further down the rankings with a run of disappointing results. He only played in two events prior to the French Open after rupturing his ankle ligaments in March. And he was handed a tricky first-round match against his old rival Wawrinka, who has…