Yamaha's Valentino Rossi has conceded that he heads into the new MotoGP campaign 'a bit worried' after concluding what he described as a 'very difficult' winter testing period in Qatar on Sunday. Rossi finished only sixth on the combined times across the course of the opening three-day test in Malaysia, and slipped to 12th in Australia, though was cautiously optimistic after placing second to team-mate Maverick Viñales midway through Qatar's final test. However, Rossi was only 11th on the last day of pre-season testing as Viñales once more led the way on the YZR-M1, over eight-tenths of a second clear of Rossi, who expressed his frustration at the situation. 'We...
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