Sepang MotoGP test: Yamaha worried by test struggle, says Rossi
|By Oriol Puigdemont and Valentin Khorounzhiy||Tuesday, January 30th 2018, 14:53 GMT|
Valentino Rossi admitted his Yamaha team was left worried by a muted showing on the final day of MotoGP's first 2018 pre-season test at Sepang
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