The 25-year-old Yamaha rider — who ended a two race winless run having last won the British MotoGP on June 17 — came home clear of compatriot Dani Pedrosa on a Honda while Italian Andrea Dovizioso was third on another Yamaha.
It was Lorenzo’s 43rd career success and sees him extend his lead to 19 points over Pedrosa, who won last weekend’s German race.
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