Hamilton suffers glitch as Formula One testing ends

(Reuters) - Lewis Hamilton's Mercedes suffered a rare mechanical failure on Friday as Formula One teams wrapped up pre-season testing in Barcelona with Ferrari back on top of the timesheets. Mercedes, whose cars have pounded out 1,294 laps of the Circuit de Catalunya, said a transmission problem was to blame. The sport's dominant team have otherwise enjoyed relentless reliability over the eight days of testing with Hamilton and German team mate Nico Rosberg completing the equivalent of nearly 20