Russian GP: Mercedes' achievement incredible - Hamilton
Lewis Hamilton says what Mercedes have achieved over the last two seasons is "incredible" as they close in on a second consecutive constructors' championship.
The Silver Arrows will clinch the title if they score three more points than Ferrari at the Russian Grand Prix in Sochi.
Hamilton's team-mate Nico Rosberg feels that winning the constructors' title would give him "the opportunity to be world champion as well".
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