BRISBANE, Australia — Andy Murray is back where he kicked off his breakthrough 2012 season and his working partnership with Ivan Lendl, only one win away from successfully defending his title at the Brisbane International. The reigning Brisbane, Olympic and U.S. Open champion advanced to the final when fifth-seeded Kei Nishikori retired with an injured left knee when trailing 6-4, 2-0 in their semifinal Saturday. Still in his way is Grigor Dimitrov, the 21-year-old Bulgarian who is starting to live up to his reputation as a star-in-the-making by reaching his first ATP Tour final with a 6-3, 5-7, 7-6 (5) win over 2006 Australian Open finalist Marcos Baghdatis. The…

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