Formula One world championship battle, and there was no love lost between Red Bull and Mercedes ahead of the inaugural Qatar Grand Prix weekend.
This has been one of the most fascinating F1 title races in many years, with the rivalry between Lewis Hamilton and Max Verstappen and Mercedes and Red Bull totally capturing the imagination.
Their bitter battle looks set to go right down to the wire, and a lot could depend on what happens in the Middle East this weekend.
Mercedes have already been dealt a blow after their request for a review of Verstappen's driving at the Sao Paulo GP last week was rejected, despite him appearing to force Hamilton off the track.
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