Mercedes chief Toto Wolff, Williams admitted that he is somewhat surprised by Red Bull's struggles during last week's Jerez test.
The reigning World Constructors' Champions struggled at the Andalucian circuit last week and completed only 21 laps over the four days of testing, struggling with overheating and engine problems throughout.
"Personally I am surprised," Wolff told Autosport.
"The problems on the first and second day were expected, but finishing the test with almost no mileage is not what I would have expected from Red Bull.
"Honestly I don't really know what has happened, I have only read the comments.
"They are a good team with a very determined...
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