Despite Merc downplaying their Jerez performance, the W05 has caught the eye of their rivals with Adrian Sutil saying it "looks quite strong."
Although it is undoubtedly too early to make any predictions after just one pre-season test, Mercedes emerged the strongest after four days of running at Jerez.
Clocking 309 laps, they covered more mileage than any other team, while Lewis Hamilton's 1:23.952 set last Wednesday was the week's third fastest time.
Asked by Sky Sports News for his thoughts on the early running, new Sauber signing Sutil said: "For me it's too early to say who is quick.
"I think the Mercedes package looks quite strong. They do a lot of laps and I have...
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