Paras Dahiya overcame an energetic Karan Singh, scripting a 6-2, 7-5 victory in the men’s first round of the Fenesta National tennis championship at the DLTA Complex here on Tuesday. A wiry left-hander who whips his shots and serves with a relish, former national champion Siddharth Vishwakarma broke little sweat in knocking out second seed Ishaque Eqbal for the loss …