Sergio Perez has set the pace on the final morning of pre-season testing in Bahrain, with the Red Bull driver posting the fastest time of the week so far after using the Soft C4 tyre.
The Mexican appeared on track with a significantly revised RB18, featured updated sidepods and an altered floor configuration.
Alfa Romeo's Guanyu Zhou finished second, almost a second off the pace set by Perez on the same rubber.
The full times and tyre compounds are listed below.
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