Valentino Rossi ended the opening day of MotoGP testing from Sepang encouraged by his pace and feeling on Yamaha's 2018 chassis. Both Rossi and team-mate Maverick Vinales struggled for most of the 2017 campaign with a lack of rear traction in hot and rain conditions, with numerous chassis updates throughout the season failing to fully rectify the problem.  Yamaha opted to race the 2016 frame - the same chassis the Tech3 team used last season - for the final round of the year in Valencia, which yielded promise. As a result, the Japanese manufacturer has based its 2018 frame on this two-year-old chassis.  Having enjoyed a strong private test at Sepang last November, Rossi once...
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