The rivalry in the Mercedes garage between Nico Rosberg and Lewis Hamilton is likely to continue as long as they're the fastest cars on the grid, according to Robert Kubica.
Kubica has known both drivers since their karting days, and during an exclusive interview with Autosport, the Pole admitted that tension within a team invariably exists when a World Championship title is on the line.
"When you are only fighting against your team-mate, it can get quite difficult," Kubica told Autosport.
"If there are some other drivers close, you have to focus to finish second, but in the current situation Nico and Lewis need to have a very bad day not to finish in the top two.
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