Mercedes admits Sepang upgrade has not delivered as Antonelli trails Verstappen's Red Bull

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Mercedes said its Sepang upgrade failed to deliver the expected lap-time improvement during Friday running. Trackside engineering director Andrew Shovlin said the W17 remained behind the field, particularly Red Bull.

Mercedes has admitted that its big upgrade for the Bahrain Grand Prix in Malaysia did not bring the lap-time gain it expected on Friday. Trackside engineering director Andrew Shovlin also said the W17 was still trailing the field, and Red Bull in particular.