XPB Images Mercedes motorsport boss Toto Wolff says the world champions “have to find out” how Nico Rosberg managed to turn the tables on Lewis Hamilton over the final stretch of the 2015 season. The Briton clinched his third world title in Austin with three races to spare but was outshone by his team-mate thereafter, as the German ended up winning the last three grands prix from pole position. Having been repeatedly quizzed to give an explanation about Rosberg’s late charge, Wolff repeats that he does not have any definite answers for the moment. “There has been so much discussion about whether [Rosberg] has stepped up his game or has the car come towards him...
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