Former grand prix winner and team owner Gerhard Berger has warned Mercedes to expect fireworks between teammates Lewis Hamilton and Nico Rosberg during the course of the 2014 Formula 1 world championship battle.
So far, the relationship between the silver-clad pair has been amiable, but a growing tension was noticeable immediately after Sunday's Spanish Grand Prix.
It was there that Hamilton finally took the championship lead from his German rival, after defeating Rosberg for the fourth consecutive race.
Former Ferrari and McLaren driver Berger expects the tension to only grow between the pair, particularly with Mercedes not having a close rival at present and their utter dominance thus...
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