McLaren Racing Director Eric Boullier believes unity within Mercedes will be impossible to uphold if Lewis Hamilton and Nico Rosberg continue to go toe to toe at the front of the grid. Following an action-packed Monaco Grand Prix, where the tensions between the two title rivals seemed to reach boiling point at times, Boullier expects more trouble at Mercedes before long. During an interview with Autosport, Boullier said that it is "impossible at this early stage of the season" when asked how difficult it is for a team to keep its drivers in check after they have fallen out. "It is very early in the season so I don't know what they have been doing. "But it is going to be...
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