Andy Murray has opened up on why he cried in the wake of his doubles win for Team GB at the Olympics on Tuesday. The 37-year-old is competing in his last competition as a tennis player, having confirmed he’d retire prior to the games out in Paris. Murray and Dan Evans put on a show on matchday one, relying on a super tie-break to Japanese pair Kei Nishikori. And the pair came through another epic last night, with the duo again needing a super tie-break to get the better of Belgium’s Joran Vliegen and Sander Gille. After the match, Murray cut an emotional figure. He is hoping to win his third g…