Toto Wolff says the other drivers will be unhappy with some calls . Lewis Hamilton and Nico Rosberg have fallen out after the race GP . they are facing tough competition and Wolff says they will win .
Toto Wolff says the Mercedes drivers may be unhappy with some calls . Lewis Hamilton and Nico Rosberg have fallen out after the Chinese GP . Ferrari are proving tough competition and Wolff says they must win .