Gerhard Berger has warned Mercedes to expect fireworks between teammates Lewis Hamilton and Nico Rosberg in 2014.
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.
"Formula one is always full of surprises," he told APA news agency.
"But as it looks today, I can hardly imagine...
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