Nico Rosberg focused on battle with Lewis Hamilton

Mercedes boss Toto Wolff believes Nico Rosberg is in the form of his career after the German usurped a beleaguered Lewis Hamilton to take control of the Formula One World Championship.

Rosberg delivered a crushing victory over team-mate Hamilton at the Singapore Grand Prix to move eight points clear of his sole title rival with just six races left.

Rosberg celebrated his 200th grand prix by qualifying seven tenths of a second faster than Hamilton before leading from the front to rack up his eighth victory of the season and his third in as many races since the summer break.